Is it possible to go back Active Duty and reclass?

Rather than listen to the rank and file, who are really just asking you inane questions rather than afford you constructive information, do as one respondent said, see a recruiter. Find out your options first and then make your decision. If you're also a single parent, understand your commitment to have someone to assume responsibility for your dependents in case of deployment. Your disability and PTSD are serious concerns and will have to be addressed. All skills have established minimum physical requirements, and your specific limitations might not allow your going back to active duty or even AGE. PTSD is a whole can of worms in itself. Evaluation is a prerequisite. That's why I concur with the other recommendation to see a recruiter. Get the straight information from the source and in writing.

So your best bet is going to a recruiter and asking these questions. Really it is going to depend on a lot of factors in my opinion. You can always "reclass" in to a different job based on your ASVAB scores and prior civilian and military service. I have had several Soldiers of mine get out of the military and go Guard or Reserves. Some received the same job a few switched.

You could always try and get into the Guard. That shouldn't interfere too much with your school. Most states offer TA or some other form of education benefit in addition to the GI Bill. Once you get that out of the way you could go the technician or AGR route.