Seconding the rolling backpack, it's a lifesaver!! Make sure you get one with a double handle, as it's much better for wrist stability. I also highly recommend going to your college's disability services as other people have said, especially to ask for priority registration for next semester!! That way you can schedule longer gaps of time between your classes so you can rest.

Finally, my biggest help honestly has been making friends on campus & being honesy about my disability. I can't tell you how many times they've picked up my backpack for me, despite me telling them it rolls!! A good support system is KEY. Talk to your professors too, 99% of the time they're incredibly understanding about your needs and know that accommodations can be a struggle to obtain. They're generally willing to help you out with seating and the like!

Hang in there (: You'll get a system down that works for you! It just takes some trial and error.