When i quit 120 mg/day habit of oxycodone after about a week I noticed a weird symptom. For the first week I had horrible anxiety, insomnia, and inability to relax or sit still. After about 10 days this was still immense, plus the added feeling of inability to even walk. My muscles felt heavy, i could barely walk, felt lightheaded and weak like i was dying. I kept going to Ers and they kept checking me and finding nothing. Is this feeling of lack of energy to even walk related to opiate withdrawal? I thought i had something PHYSICALLY wrong with me, like on verge of death, inability to even stand or breathe. After 3 weeks it was all gone.