iTunes not recognizing iPhone

I just recently updated my iTunes to 12.4.3 because I got tired of it asking me if I wanted to update. Well, now my iPhone will not even show up in iTunes. Even if I go to File > Devices, everything is grayed out where I cannot select any of them. Can anyone help me? This has been going on for a couple of weeks now. I can't even sync my music to my phone and that is the ONLY reason I use iTunes.