hi your not alone,,i also had a serve reaction on chantix but it was after i got off of it,,,i quit smoking for 63 day,,then went off chantix and my world went haywire plus hubby got sick back on smokes,,tonight i read a book my friend on here sent me a link to,,and i've been quit for 1 hour now and i'm staying that way,,cold turkey im also"was" a very heavy smoker... good luck keep in touch..we can beat this