Panic and anxiety about my health and future.

I'm 24M, got multiple sclerosis since I was 15. Had a couple of panic attacks in the last months while sleeping, like I suddenly woke up afraid of losing the use of my legs and felt my heart beating so hard I had to walk around the house in the middle of the night to prove that I could still use my legs and just calm down. This last year has been totally negative, and today my 3.5 years girlfriend told me that she's going to move to Denmark(I'm Italian) . I guess this is the lowest point in my life, I'm scared about the future, the present, I'm scared about talking to people and while I talk I'm constantly thinking "omg I'm going to say something stupid, I don't really want to talk to these people, I want to go home". What hurts me most is that I used to be a different person years back, and I'm wasting my youth panicking because I don't know what to do. I'm spending my vacation laying in bed and crying, anxious to get out of my house because I don't want to meet anyone. Sorry about all this, I just needed to write down how I feel.