Generalized anxiety disor. Be veery!

Since last 2 days I've been having too much thoughts and it feels like it'll stay like this forever. This mere thought of me not getting well scares me every time. I want to feel normal again please help. The anxiety is for no specific reason even smallest of things scare me. Also when I'm ok i feel as if the thoughts will come again in my mind and they scare me again. I feel like my whole life is now wasted and I'll have to live it with being retarded. I read about GAD online and it scared me more. Watching anybody happy makes me feel jealous as i can't be like that anymore . I will be veeeery thankful if you could provide some help. I don't wanna die or live the rest of my life like this. I have dreams and expectations from my life to fulfill but if this disorder isn't cured I'm not sure I'll ever be like i was before. PS: Had weed a week ago but everything was fine all this while i don't know what to do. Please help.