Hip pain & not feeling rested when sleeping on a brand new mattress

Hi! Looking for insights from others about after buying a new mattress that has increased my hip pain and I do not feel rested in the morning. I have fibromyalgia that is focused in my hips, neck, shoulders and upper back. I am a side-sleeper and sleep with a body pillow or pillow between my legs to align my spine. We bought a Brooklyn Bedding Aurora Luxe Cooling Firm mattress. It was delivered almost 4 weeks ago. Within a few days after sleeping 2-4 hours hip pain started awakening me. I’ve tried changing the type of mattress pad, bought a new body pillow and pillow. Nothing has helped. The pain is so disruptive I now get up in the night and move to a futon that we have in the guest room. I go to sleep pretty quickly, sleep and get up without pain. We are going to return/exchange the mattress. Does anyone that deals with chronic pain have any tips on choosing the right mattress? Thank you! Jolene