Irregular periods. Other stomach issue.

Facing issues with periods from so many months after delivery of baby .. sometimes it got late ,sometimes heavy bleed, and this time no periods but continuous spotting from a month.. took Pause on recommendation of gynae..periods got stopped then again spotting started nd since then so much abdominal cramps ..had ultrasound, doc suggested ET is thick and suggested progesterone which doesn't suit me bcz of severe constipation as I had the same in pregnancy .. are these cramps due to this condition or it is not related to this and some other stomach issue...the pain radiates from lower abdomen to upper part..the pain become worse specially after ultrasound...neither ultracet tablet doesn't working well nor walk...pls suggest..pcos was already there even before delivery..and somehow got pregnant after 12 yrs of marriage and now again pcos detected..weight has been also increased after delivery.around 10 to 12 kgs..currently at 70.5 kgs..height 5'4