I know I'm responding VERY late, and you most likely found your answer but...
I have to belive it was the APAP that made you sick. I had a script of what you have. Actually I've had 5/325, 7.5/325, and 10/325. Percocets (Oxycodone/APAP) and Vicoden or Narcos (Hydrocodone/APAP). I've never taken more then 12 pills in a 24 hour time period. I've only had to take 12+ pills when I had the 5mg ones. My tollerence was never that high.
Your daily limit (without poisioning or over dosing yourself is 4000mg of APAP) Yes that is a lot. 12 pills however is only 3900mg just don't take anything with APAP/Acetaminaphen/Tylonal in it. To be safe nothing with Ibprofin, OTC pain relif pills (actually called "Pain Relief" or "Pain Relievers") Asprin, Excederin, Naproxen, ect.
I don't know if they are cross tolertant, or add together for the OD factor, but they most likely would and if not make you sicker.
When I got into 8,9,10,11, and 12 pills I would get neasus. That's because I was very close to, if not over 3000mg of APAP. Anything under I was fine. At one time my tollerence was anywhere between 80-100mg of Oxy. Depending on how full my stomache was, what. I had eaten/drank, and a few other factors. One day I came across a script of 40mg Oxys. The kind that can't be broken down to be snorted or ived (I would have sniffed). So I popped two of them. So that's 80mg of Oxy and 0mg of APAP. The day before I had to take 90mg to get the high I wanted. I only had Percs 7.5/325 so I took 12 pills. I took them all, not having time to do a CWE (I wasn't home all day, and I wasn't at a place I was comfortable enough to do a CWE out in the open).
I had to take 3,900mg of that horrid APAP to get 90mg of Oxy, to get a good high. Back to my two 40mg oxys. My stomache was fuller being I didn't find my (remaining 5 or 6 40mg pills I had from a surgery a few months back) until about a hourish after having two PB&J sandwhiches and a large glass of milk. So I then took two 7.5/325 Percs. Brining my APAP total to only 650mg and my Oxy to 95mg. I now achieved my high, with less APAP then I have used to treat a migrain.
I told that short story to simply say one day I got 80mg of Oxy and a terrible stomache ache while the other day I got 95mg and NO stomache ache what so ever. That's why I CWE anything over 3000mg now. Well at the end of my binge. I'm clean now. Been alomst a full month. Quit taking 40-80mg of Oxy/percs/vicdones a day, and 3000-4000mg of gabapentin three times a week cold turkey (other then that I've only ever done weed which I quit years ago).
Imo APAP makes you sick and not the opiate itself. If you want a good high with no pukey feeling, and can't get the pure stuff do a CWE. The only down side is its liquid. No popping, no sniffing, and it taste horrible. You can mix it, but nothing more then you can finish it a decent sized sip. Chasing ddoesnt help the taste either. (Chase with White Grapefruit Juice. Hits faster and harder). Final downside it takes awhile to do and isn't something you can hide. The positives are, no more neasua. Its a liquid (can be an upside, so your not dealing with a handfull of pill. Also no having to swollow pills). And it hits hard and fast. Second fastest to iving, but its faster then sniffing. Last longer then sniffing and iving but not longer then poppin.
CWE is short for Cold Water Extraction. To make it short and simple pretty much do this. Crush all your pills into a very fine powder. There are MANY ways to do this. Be creattive. For awhile I crushed my with thr round side of a spoon. They have to be very fine. No halves, chunks, even grains. Almost powder sugar like. Like your ready to sniff, and then mor once you did that poor the powder. Into a freezer safe cup/small container. Fill with water, just coovering the pill. Then freeze until its cold enough, where its just before ice. If you have time put it in the fridge for 24 hours. Workss better imo. After you have yoour, very very cold pill powder water, stir it a bit again. Then plce a coffe filter, or folded paper towel on top of another cup. Filter works best. Make sure its sucured enough to stay when sonething is pured on to it. Now slowly pur your water from on cup to the other, THROUGH the filter. Very slowly. The water will go through, and a white goop will sit on the filter. The goop is the APAP. Drink the liquid and enjoy the buzz