I don't know how serious it is, that would depend on how big all the squooshed bits are and what they may be touching or pushing into. (The idea that you feel better after just a week of limited activity make me think it's probably within the realm of PT, but don't quote me on that!)

Most people have disc bulges here and there and now and then, which don't bother them until something else comes along to aggravate the situation. Your DH probably has one or two and doesn't even know it!

Your body can compensate for a zillion things, but along comes the last straw and suddenly you find out about *everything*! Even stuff that might not be causing the pain you feel!