Almost every night I have to have my back scratched or i'm up scratching myself from head to toe... I also find that if I try to ignore an itch I twitch heh, so bad, that my whole body jumps and I end up waking my fiance.
The heat really gets to me, I have psorisis, and with that I get incredibly itchy and irritable when it's hot, my body won't let me sleep and my heart starts racing. I usually have to live it out until i've pretty much ripped off three layers of skin, my back is scratched and the fan is in my face.. Then.. I can sleep.
As for marijuana, I used to be a chronic, but I found myself very quiet around people when I smoked and I just ended up smoking by myself. After a while I noticed that if I didn't smoke my anxiety would increase x10 and it just wasn't worth it, so I stopped. Occassionally, at the rarest of rare times i'll have a toke off of a friends joint, but I have to be really drunk to handle it.
Seems to me that if anxiety is not dealt with properly it just keeps getting worse.