I wish I had all the answers for you....
First, welcome to healing well. I'm not sure how long you have been around, but as of yet, I don't remember you.
Some of the side effects that I experienced when I first started taking Percocet (5mg oxy and 325 of acet..) ranged from insane to mild. The main side effect I noticed was mood swings? I could go from very happy to bawling over the smallest thing... it was quite humorous to my family - and embarassing for me. It seemed there were times I would get a okay pill and my pain would be helped and I didn't feel mentally unstable and other times I would get a "good" pill that would knock me for a loop. I often would feel tired - but then try to sleep and my mind would be racing so fast that sleep was just not going to happen. I found that by taking the medication 2-3 hours before going to sleep I could avoid the racing brain. I've also found that for me depending on when I eat in relation to when I take my pills they hit me harder at some times than at others. You may find it best to eat a bit, take your pill, and then eat a bit more, or you might find it works better to take on an empty stomach.
As far as the tingling and itching - I can't tell you. The itching could be an allergic reaction - or it could be some part of your brain being affected by the narcotic and more of an itch for no reason.
Feeling sick to your stomach I think is a pretty common part of dealing with pain medications. I feel sick every time my dosages are raised. The first few days I was on a new dosage of my long acting medication the pharmacist recommended anti-naseau (can't spell) medications that helped a bit.
If the side effects are bothersome for you - call your pharmacist and ask them. It is their job to be there to answer your questions, and to know all the information about
the medications they are filling. The pharmacist might be able to suggest things to make the side effects less bothersome, or get rid of them all together.
I wish I had better information - all I know is how I react to different medications - and every person's body takes them differently. I hope that if nothing else they are giving you some relief from the pain you are experiencing.
"When we come to the edge of the light we know, and are about to step off into the darkness of the unknown, of one thing we can be sure; either God will provide something solid to stand on... or we will be taught to fly.'"
"Cause when push comes to shove You taste what you're made of, You might bend, till you break Cause its all you can take; On your knees you look up Decide you've had enough, You get mad you get strong Wipe your hands shake it off, Then you Stand" From "Stand" by Rascal Flatts
Dx.: Polycystic Ovarian Syndrome, Ulcerlative Colitis, Chronic Inflammation of the Colon, Ruptured & Fused L4-L5-S1 w/pinched nerves, Degenerative Disc Disease, Chronic Costochondritis, Back Muscle Spasms, Asthma, Benign Tremmors (hands)