I am a recovering heroin addict of twenty years in addiction..I have been injecting heroin for about 3 weeks, although have just had 6 days off all drugs...i was feeling ok and then bang in the space of two mins, my skin feels like i have dry eczema under the skin of my whole body, i am very very cold and also shakey, i also have numbness all over including pins and needles, and lastly a thirst i can't quench - can you please advise