I know where your coming from bro. Its like we got an unspoken friendship immediately cause ive been to hell and back like you...well actually im still in a sort of hell but it does get better, i think...I suffer from anxiety disorder and i suffered from panic disorder for months on end every night. My hair started falling out from it, my appearance took a 360 degree turn..i looked like shit. Docs assured me my hair will grow back given 1 to 2 years from the damage ive done to myself. Who knows if they even know.
So believe me, i feel you. Its hard to stop worrying, noone can just tell you not to worry....you should see a therapist, talk out whats bothering you and get yourself on medication. You cant beat anxiety alone, its a chemical imbalance in your brain. Get on some anti-depressants, they help ALOT especially you have panic attacks.
And DO NOT i repeat DO NOTT smoke weed. You will feel like you are going insane if you do being that it brings out anxiety in people prone to it.
Also, try to find a doctor willing to hook you up with xanax's for those times u cant seem to relax..they help so much. Other than that, keep your head up. its a struggle i know, but with proper medication and therapy, you can get over this.