Yes, you can get food poisoning. Oxy will not make you immune to that, if thats what youre asking.
Im curious though, have you been dopesick before??
Hopefully in text that doesnt come off as condescending, as thats not my intention but it kind of sounds like that "recreational" habit caught up to you and you can "bearly feel" the oxy because youre dopesick.
Either way, sorry to hear about your situation. Get some electrolytes in you and stay hydrated.
Baby wipes or "wet ones" are also up there on the list of crucial items for both dopesickness and food poisoning.