I want to cleanse from the pain killers (tylenol, advil, (ibuprofen) & aleve) I've been taking for cronic headaches. How long before its all out of my system?

Chronic NSAID's+Tyl. These medications won't be detectible in your system within a few days after last use. Multiple problems are associated with long term use of these medications & some can persist even after complete cessation. Chances are you have not exhausted your body's reserve in handling these medications. Don't be surprised if your gerd (profile) & headaches improve after you stop these.