Could this be anything besides pregnancy and should I see a doctor?

The past few weeks I have been feeling extremely hungry, slightly nauseous, and really tired. It initially started with nausea like 3 weeks ago then about two weeks ago I became really sleepy, and lately I've been really hungry. At one point I was dizzy, and I've been having this weird rash on my hand that comes and goes the whole time (dunno if that has anything to do with it.). I didn't even have sex until this week after like a month and a half of not having it, and we used protection, so I don't think it's pregnancy. Any ideas aside from that? And might I want to go see a doctor? I think I'm also starting to get a cold because I'm sniffling, if that might be important...