please read I don't know what to do!! 15 dpo

Alexis
So for the last two nights I have woken up and my chest has hurt so much it hurt to breath not my boobs like under my boobs I think. I have also been having some killer cramps and acid reflex and I'm peeing more and sleeping more and no appetite. I'm 15 dpo today period is no where in sight. I went to the doctor already and they wouldn't even do a blood test all they did was have me pee and it was negative and I already took a test at home. They did no test except tell me I have a UTI. My period is one day late and idk what to do or where to go please help