I dont know if it's a UTI or a yeast infection? help hurting bad!?

here are my symptoms... it doesnt itch out side my vagina but it does itch inside, um i got a pressure where my lower stomach is and it hurts laying on it, theres that one time out of nowhere when i randomly got naustious but didnt vomit, i dont have a fever, there are time that i got to pee but not every 5 secs. my discharge was like white and clumpy looking but its not bleeding and it hurts when i have sex. oh yea um can any of these are contagious to my partner without an condom?