What are the best mattress es/pillows for someone who spends most of their time in bed?

Basically what it says in the title, I have both pots and chronic hip pain, if I lie on my side it helps my hips but I will essentially be trapped on my side due to the pots, but sitting upright is terrible on my hips but at least I don't feel like I'm being weighed down by sand bags.

I have the money spare atm to get myself a comfortable mattress and the right pillow supports to stay upright, currently I'm sleeping on a free mattress I got from the council a few years ago, and when I'm awake I'm normally propped up with a bunch of random pillows and a cushion to ease pressure on my tail bone, but I think the pillow situation is making my hips worse, i have been putting off getting a new mattress/bed because all the reviews I can find aren't really tailored to someone who spends 70% of the day sat in it. Thanks in advance!