I had triple arthodesis with proximal bone graft my doctor put me on oxycodone /acetaminophen 5-325 mg could this meds cause to have hot flashes?

Unlikely : Usually oxycodone does not cause hot flashes, you should check your temperature to make sure you do not have fever and other thing to check will be look for signs of infection like redness and swelling and increased pain at the surgery site. If you notice any of these get in touch with your surgeon. If you do not have much pain you can stop taking the oxycodone also. Hope that helps.

Unlikely: However surgery causes significant stress to the body. Opioids can cause lightheaded ness so that is also a possibility.