Brain overload

All I have been doing lately is think. Life is not so enjoyable when everything that is on your mind is a worry of some sort. Every single thought that runs through my mind is a worry, life stops a little, except that life does not really stop, you stop but everything and everyone around you is continuing on. I feel as though I am slowly dying a little every day. I worry if I will ever be able to run again, let alone walk without a limp, play sports, jump on a trampoline. I worry about my hand if I will ever be able to go a day without losing some sort of feeling in it. Will I lose the use of my hand before I even get through school? Will I get into medical school? If not, what would I do with my life? I sit and wonder if I will ever go a day without feeling some sort of pain, either a physical one or an emotional one. I feel as though everything I have worked for is going to come crashing down around me at any second.