I just became aware of my own mortality?

Iam only 22 years old, but the past 2 years my body has changed alot. I had a mental breakdown about 2 years ago, and it induced an auto-immune disorder, and not to mention I had to give up a 10 year long fighting career (mma,kickboxing, sanda) due to numerous injuries. Now, iam a teacher, but the other day I started thinking. I started thinking about how my body has changed alot the past 2 years, and it is slowly getting worse. Although I take good care fo myself and have a healthy lifestyle, I know all that I can do is SLOW it down. I started thinking..."how will I be in 5 or 10 years?" "will I make it that long"....."will there ever become a day when I can no longer train and teach martial arts because of my health?" ... right now I have pains all over my body, and other ailments I dont wanna talk about....but hey are mild enough to where I can still train and teach and get along ok. But, I know its going to get worse....iam constantly seeking methods to improve my health in hopes of stopping its progression. I have no medical insurance, and basically Im giving everything to my dreams right now. After realizing these aparent truths......im scared to death. Any words of wisdom to help me push through?