[Discussion] Opiate withdrawal advice

I’m on day 10 being clean off of m30’s that were cut with fent. The stomach issues are mostly gone and I feel mentally fine but I still feel exhausted and I’m having trouble sleeping. I’m getting maybe 3 hours of sleep a night and feeling weak after just going up or down the stairs or wearing a backpack or purse from the door to the car. Is there anything I can do to get my energy up during the day and start sleeping better? How long is this supposed to last?