I am 32 years old, have PCOS and a thyroid condition. Also,Mirena IUD. been having the following symptoms for the last few eeeks: Weight gain, tightening of my stomach muscles, nauseauted all the time, stomach (pelvic) cramping and lower back cramps and aching. I have an appt sch. with my ob/gyn, but the tightening has gotten tobe muchmore painful. Is this something to be worried about?