I understand what you are going through. I had recently gotten a scholarship to my local university due to my elite soccer skills. . Then I fainted, hit my head, and haven't been able to run since. I'm at one year.

You will improve, WHEN you recover, I recommend taking up a less intense sport
If I have any advice to give, do not isolate yourself from friends and family. And always try to get out of the house at least once.