18 months and today i had very bad anxiety

I am 18 months clean from weed… I never smoked in my life The first 4-5 times i smoked i had a panick attack which turned my world upside down First 6 momths were HELL but i started getting better little by little But can anyone tell me why today i am feeling very anxious,like the first months when i was going through this i dont know why its feeling like im going backwards and not forward with this process

Will i ever heal ?