Bad stomach cramps at night, i have mirena not sure if its connected to pains?

i had my mirena put in months ago, i was on the pill for 5 years mainly for period cramps, i havent had many cramps since the placement of the IUD, little ones here and there when id typically get my period, the past few nights ive been getting woken up by excruciating stomach cramps and i cant get comfortable and curl up in a ball, they last for generally 20 minutes, but i get very hot and dizzy and short of breath and nauseous, almost the same feeling i had when the IUD was inserted. after i go back to sleep i wake up in the morning with tightness in my stomach, hips and lower back that last almost all day. ive also been very tired even if i sleep well into the day and i dont have the best appetite (my appetite is never consistent anyways) i have no pain during sex and i can still feel my string. what could this be ? im not sure if all this is connected to the IUD so i want to look at it with and without the IUD.