I have had a problem with very annoying abdominal contractions for the last 1-1/2 months. I am a 60 yo male. I was on Percocet for 5-1/2 month for a neck injury and I tapered down and stopped taking them 1-1/2 months ago. During the withdrawal process I started having very rapid abdominal muscle contractions that only occur when I lay down or I am relaxed. Some days they only last a little while, other days that have lasted over 3 hours. It is impossible to sleep with the contractions going on and sometimes they get so violent they will wake my wife up because the whole bed shakes.
At first I thought they were some sort of myoclonic jerking (the involuntary muscle movements before you fall asleep), but I an no where near sleep when they occur. They initiate on an exhale and if I take in a deep breath and hold it they will stop.
I'm stumped what might be causing them. They could be from the opiate withdrawals, or they may have been covered up and did not present themselves during the time I was taking the Oxycodone. Any ideas would be helpful.