I agree with the other folks. How do YOU know things can't get better and your life will be a failure? Are you psychic? So, you might not get into the "school of your choice." Not everybody who is successful in this world went to that school, did they?

I would check about special help due to illness and keep seeking a diagnosis as to why you have the immune issues.

By the way, cognitive-behavioral therapy can be very helpful. Okay? You can have a good life ahead of you.