So, here's the deal, right now I'm living at home and going to college. I live off of SSI and foodstamps and of course, since I have free government insurance the chiropractor isn't covered. I simple can not afford to pay like $100 or more each time I go. The problem I am having is a disc in my lower back will pop in and out once in awhile. I can deadlift most days fines, or do most exercise just fine, provided the disc is in place. It seems to pop out if I do anything involving me leaning down too much. So I can do deads, but I can't do standing rear delt raises, or bb rows with my torso low, or it'll pop out. When I go to lay down on my back, I'll feel it crack in that area, even on days I feel fine, or I haven't lifted, it'll just crack alittle bit, instead of a lot. What I'm wondering is, if I can save up money to buy a black foam roller, I have a red one, but I was wondering if the black more dense one would help out with this problem and also if I bought a teeter hang-up would it help with this issue? I've owned and inversion bench before, but it was a cheap one with cheap ankle locks, so I never used it and I got rid of it. Also I was wondering if I bought an 8 inch memory foam mattress if that would help too. Any advice?