Frustrated with Doctors: Severe Cramps and Nausea

I am really frustrated with my doctors two weeks ago I started having really severe cramps. I went into the doctor and all they can tell me is it is not a uti but they gave me medication to treat a uti just in case and told me to come back if it didn't get better after the medication. thus was over Thanksgiving. Finished the medication didn't help went in again all they did was check if it was a uti even though we already knew it wasn't a uti. I have pcos and already have one cyst and am worried about that so I am making them do a blood draw and the previous doctor said somthing about a pelvic ultrasound so getting that. Has anyone had severe cramping and what was causing it because my doctors are not helping me. my symptoms are severe cramps, nausea and tiredness.