M.D.
My mom has a disc problem. Has he ever had xrays/mri to see where it is? In my mom's case, it is towards her back from her spine (as opposed to towards her belly). So she does stretches that will help the bulge to get "sucked" back in. In her case, she gets on her back and pulls knees to chest. If you can envision it, the disc is compressed on the side that is towards the belly and "opens up" the side that is bulging which creates a pull on the bulge to get it back into place. She does this every day morning and evening. If she pulls it, she uses ice and stretching. Heat can cause the bulge to swell and increase the problem. Your husband may have to experiment to see what stretches help him.