I'm a little half way through school for EMT B myself and just the fact I chose to read this thread may be saying something about my own status. I think, I am making this class harder than it should be for me. I keep expecting this brick wall of a problem,Exam,Clinical experience, or something to Just take me out. The fact of the matter is,I have a "A" so far and have scored as high or higher on the exams as the rest of my classmates. I am 42 and was an Air Traffic Controller when I was your age, and I seemed to do my best and be more calm when the aircraft I was controlling was on fire. People tell me not to worry about stuff so much, but I have never been the kind of person to take having other peoples lives in my hands lightly. To be honest, if you weren't a little stressed that would worry me more. Keep in mind that this is coming from a guy who woke up at 3am with a splitting headache @@@@@@ off about the fact he couldn't remember the normal heart rate for a pedi. LOL Some of us are just worry warts by nature. I agree with the others you just have to find a way to blow off steam and cope in your own way,and that goes for life in general. I think, If your not cut out for EMS and you do make it through school that you will most likely realize it fairly quickly in the real world. Sounds like you have more than your fair share of obligations and responsibilities right now and the fact that you would be assuming the role your playing in your family says a whole lot to me about your character. I have a saying that has been pretty true. People find a way to do what their heart really desires no matter what! They also easily find an EXCUSE Not to do the things they don't want to do no matter what.
I would finish school and then try to resolve the back problem if at all possible.Its only going to get worse with age, not to mention make it hard to get a job.
God speed !!!