Can I mix these pills (diphendramine and oxycodone) in the same day but different times?

I don't need any comments about how pills are wrong etc, im not trying to end my life i was perscribed this diphendramine. I had 2 7.5/750 hydrocodone around 530pm. Aroudn 730 I took 2 5/325 oxycodone. it was a nice little buzz but i never ever pop pills so my tolerance is really really low. i really want like a high tho now so if I take 4 50mg of diphendramine will i like OD, or just like have a trippy high and fall asleep? i appreciate it!