Been gassy for 2 weeks and stomach has been making a lot of noise. have some gas pains. back hurts. had unprotected sex. what can this be?

Not related to sex: The gassiness is probably not related to unprotected sex. It could from a disturbance in your intestinal flora from recent medication, mild viral infection, or something you ate. You can try taking an OTC antacid for fast relief but may need to add a probiotic to address the problem more fully. If the symptoms continue, see your primary care doctor for further evaluation and management.