How can I tell my gym teacher that I can't do gym!?

I have a bruise ribs on my right side, my neck hurts in the front, and my back shoulder hurts (basically, I think all of those was from snowboarding) My gym teacher never believes me that I cant do gym! And, my mom wont write a note and they kinda know my parents handwriting. How can I tell my gym teacher that I cant really do annything?!

Another question, how can I make an exuse for leaving the class room without permisson? I always go to study hall after lunch where you can finish any missing works or homeworks. I moved and at my old school, we were allowed to leave the classroom without permisson! Everything changed and I cant get used to it! I leave the classroom without thinking :/ Please help me!
 
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