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laying more on your left butt can cause more pressure on the siatica nerves there which run into your left butt and legs and can cause numbness and tingling in that area and even pain which can radiate down into your left leg.
I would sit on a soft cushion with both sides of your butt if you can.
if you have constipation or hard stools, you may need laxatives and stool softeners to help you with bowel movements.
I'm sure you are on pain medications which can cause constipation.