I had unprotected sex for almost two years now, but suddenly i have lower back pain and cold sweats what's the meaning of that, i'm i infected?

See a doctor: If you are having unprotected sex, stop. STOP. Use protection. Fr your symptoms, see a doctor in person, tell them what you just told us. It may have nothing to do with unprotected sex, but it might get you to stop playing with fire. A good rule is ONLY have unprotected sex with someone who you want to have a baby with, and only when you both are ready for and capable of raising a baby