Study your protocols for the county you are working in, ALS drugs you carry on your rig, start to learn ekg 4 and 12 leads, always review the basics and never stop learning.
If you are trying to lose weight I would stick to the cardio (run, bike, row, swim, stairs) and stay away from the fast food. If you are trying to gain weight stay away from cadio and EAT double the amount you usually do while lifting heavier weights with lower reps.