Mattress gives me constant body and headaches

I wanted to love this mattress, but after 1.5 years with it we are finally getting rid of it. It’s like sleeping on a rubber band (another user said the same) there’s no support, my hips sink in (on side, back, and stomach) and at the same time it creates a lot of pressure on your joints. I should note, I weigh 135 lbs so if it lacks support for me, I imagine it does most people. I’ve had terrible sleep and health issues from sleeping on this mattress. Almost daily headaches began when we started sleeping on this mattress… I’ve ordered so many pillows, tried all sorts of topper combinations, I’ve even been to physical therapy, not realizing the issue was with the mattress- headaches are gone instantly when I travel or sleep elsewhere. It makes me sick thinking of how much we spent on this mattress but it’s just not worth it.