What the heck is this Left side of back rib pain.

Dont know if this is related but ever since i started taking miralax which i stopped about 3 days ago because i wanted to prevent constipation from fentanyl...

My lower bottom rib or under the ribcage is SORE.. like its not too bad sitting down or laying down but hurts to stand up and walk a bit.
Im using the bathroom every 2-3 hrs with LOADS of gas. Im VERY VERY gassy, very very loose stools.

I called my G.I and the nurse said it CAN be caused by the miralax because food is passing way to fast i guess.

Im confused.. I hate this this... I just got over a lower lumbar injury and now this.. but the pain is just a little higher now left side.

Yes. the pain is gone. Took too much miralax every night.. Haha.