 [ Symptoms ] nausea and hot flashes normal  i feel a sensation of nausea just before a hot flash is that normal 55 and healthy [ Disease ] hi having unprotected sex anytime is always a danger if you do not know the person stds and stis can pop up anytime but sounds like you did the right thing if you r that worried get your self off to an stdgum clinic and get yourself tested that is about all you can do but it needs to be about 4 weeks after you had sex do hope this helps good luck