You took 2 or 3 pills but how many miligrams? you nausea can be induced by movement, almost like motion sickness. you should veg out and watch a movie, listen to some music. or lower your dosage.
in any case, if your not used to taking them, or are not taking them for pain management, 10 mg should be more than enough o get you high.. since they seem to last so long i am guessing they are percocete with tylenol, which is a buffer.. depending on how much tylenol is in the 3 pills, it could be contributing to your illness. remember you can over dose from tylenol with only 1000 miligrams. so if you have to take more percocete and ingest that much tylenol, it's not worth it ~