I was/am on a similar path. I have finished paramedic school and my associate's. I decided not to do a Bachelor's in Fire...while many places said I could transfer and finish a 4 year degree in 2 years, it was really 2 years and some prerequisites. Also, none of the prerequisites worked for any other degree I was interested in. I had considered doing a BSN, but after a few courses, realized that nursing wasn't for me. I have settled on eventually going to Med school.
A few tips:
#1, I am fortunate in that Fire/EMS is my second job, and that I make enough in another field to pay cash for school. This is an important distinguishment: if you are taking loans for school, you can usually only take about 150% of the total credits necessary for a bachelor's degree. In my case, I have over 180 semester credits, as I started school 10 years after high school and they made me retake tons of easy classes. I have yet to gain a bachelor's degree. For example, while I may only need one year of strong physics to be competitive after 2015, I had to take 7 math classes just to get to take a physics class. While I may only need two biology classes, I had to take two other biology classes just to take the ones I needed. If it has been a while since high school, you may not need this stuff for an associates, but you may need it when it comes to completing the requirements for Medical school. If you can only take loans, you may not physically be able to take all the schooling you want to. I would advise skipping the bachelor's in fire, most places only care that you have a degree in fire (your associates) and that you have a bachelor's for promotion (chemistry or biology should do).
#2, if you are planning on Med school, know that unless you are a gay, bi-racial, Eskimo from an Island no one has ever heard of, you can't get in with just the "average" acceptance grades/scores. Most medical schools require about a 3.8 GPA and a 30-35 on the MCAT to apply. If you are not extremely unique by virtue of your birth/upbringing, then plan on getting a 3.95 GPA in ALL of your schooling, including your associates and paramedic school, and then rocking out a 40 on the MCAT just to get in. If you have a 3.6-3.7 GPA, you might get in to a very small school or one that few people go to. If you have below a 3.5, you should look into PA school.
#3, Even if you still have great grades, you should still consider PA school. First, the cost of schooling is dramatically lower and it's two years including residency/internship, vs 5-9 years of medical school including residency/internship. Additionally, doctor's salaries across the board (with a few exceptions) are projected to decline over the next ten years while doctor's costs like malpractice insurance are expected to go up. PA's salaries are expected to go up, and they usually have a hospital/doctor pay their associated costs. Also, while the average doctor makes more, they don't make that much more when you look at a per hour salary. The average doctor works around 60 hours per week, while the average PA works less than 40.
#4, I did Paramedic school two years ago. It nearly broke any personal relationships I had. The first 3 months were a breeze. After that, I sincerely spent 8-12 hours per week in the classroom, 40+ hours a week doing clinicals or ride-alongs, and another 20-40 hours per week of studying, just to stay in class (this is aside from working a full time job as well). People dropped like flies every week for one reason or another. Point is, I had prepared for it to be like that, and I was fine with the sleepless nights and never seeing my loved ones...but...after a while, they weren't ok with not seeing me. Could you do that for 4 years in med school?
Me: I decided that after I had explored everything, I still wanted to be a Doctor. It's the work that interests me most. My loved ones are still very supportive. I have taken every quiz in every class from day one as if my career depended on it, as medical school acceptance does factor grades. I have time working in the medical field, a few years of volunteer experience, I am starting to shadow a few doctors (trying to get in about 500 hours) and gonna try to work in a lab for a year or two and get published. I had a 4.0 until my first A- this spring, and now I have a 3.98. I am taking a Bachelor of Arts in Classical Humanities with Honors and Honors Research and a Bachelor of Science in Public Health with Honors and Honors Research. I am good at taking tests, but plan on studying for the MCAT for 6 months and taking a prep course before my first MCAT try. I am 30 and Caucasian and from Ohio, meaning, I may still have trouble getting in to a school. But, I'm going to give it my all.
You should search long and hard about whether Med school is the right option for you, and if you are really willing to do the extreme amount of work required just to get accepted. If so, then give it your all and don't look back.