Double memory foam mattress (Brandon DH7)

Hi I have had this mattress about 2 years now. I've had to cope with it because of my back and legs I have physical problems. I'm in a supported accommodation,with mental health I got offered a mattress I donated it British heart foundation because it would of made my back worse. I'm waiting for further hospital appointments for more investigations I'm in pain constantly I have no one to turn too no support if anyone can help I would really appreciate it thank you