Hi
Cathie,
Are you sure about that butrans dosage? Is it 5 mcg (rather than 5 mg)?
Those effects could be the butrans, the gabapentin, the butrans interacting with the percocet, or some combination. They should subside within a few days to a month (everyone's different) but if they are intolerable, or anything more serious occurs, I think a call to the doctor is appropriate.
You know the drill....

Use Google and read up on them.
Hoping it all works out for you with far less/no pain,
Doc