Of course its dangerous!
Drinking water is dangerous, even fatal, if you try breathing at the same time.
I was in the same situation when I started Aikido. I was recovering from a bad shoulder injury. Rolls hurt like hell, break falls made my eyes bug out, and my shoulder sounded like a bag of rocks rolling down hill. To make a long story short, I discovered two things:
1) If something hurts when you do it, do it differently next time or learn how to deal with it with aikido - ie nage bears down on a joint with a technique, respond with ukemi- take the roll, drop you center etc
2) The simplest thing that did me the most good -- BREATH OUT whenever you execute a techique or take ukemi. You will always breath in afterward (When I breath in under stress I hold my breath) and best of all --- you can't get the wind knocked out of you with your lungs are already empty.