Guilty nausea from sex


I’m a relatively sexually active person but sometimes I get this big wave of guilt or something and I get really nauseous... it happened during a hook up and I almost puked in his mouth (I didn’t tho—I was able to keep everything down and he didn’t notice because of how I handled it) and now I’m having that same feeling and I’m supposed to get some tonight... has anyone experienced something similar? Any advice maybe?