Ohmy. :c
Well, let's look on the bright side, you have a new opportunity with that new school of yours; A chance to start fresh. Take your time making friends, focus on your studies for a bit. It is important to make friends, yes, but you can form them once you grow more familiar with the school itself. Just be friendly, and open, as I'm sure you are. Physically, if you feel injured, try to rest. Find moments, no matter how small, to just relax. If they really do hurt, you should consider talking to whoever coaches your team or a supervisor of some sort. I hope you get well soon, though. c:
As for your aunt, just try to be understanding. Help around the house (Which I know you do) and try to be appreciative for what you do have. Stay positive and hope for the best. Try to help nurse her to health, should she return to the house. Remember that we all have issues in our lives, but that which does not kill us only makes us stronger. Best wishes. :)