Endometriosis? Paranoia? Something else?

I have been on bc pill for six years without much issue. I came off it in Feb to start getting pregnant. Had some pain during ovulation, had a late/short period as I assumed my body was acclimating and then again ovulation pain in March. But it didnt go away and it turned out o was pregnant. Yay. But six weeks later I miscarried. That whole time I was still crampy in the low abdomen. Since the miscarriage I have still been crampy and periods have been regular starting between the 27th-30th every month and lasting four days. Weirdly i felt better on my period than the rest of the month. THEN last month i didnt feel better but didnt feel worse until last week where I had one of my worst periods. Cramping bad and queasy and working out at the gym my heart rate would increase too quickly and I had trouble walking straight on the treadmill. It lasted the four days then abated. I had a progesterone test three months ago that should my luteal phase was okay. I am 35. I also have abdominal pain when my bladder is full and sometimes cramping with bowel movements. Is it possible for endometriosis to gradually build up after coming off BC? Is it possible for the progesterone test to come in fine and there be endo? Anyone else experience this stuff? Gynos just tell me to relax and destress. But this last period was terrible!