I don't know if it's drug abuse, but it is using the drug in a way that it wasn't intended. As needed at bed does not sound at all like take every time you are awake. If you need something to function, and you don't have a prescription, then that is a good reason to be IP since that's what they do is medication adjustments. Your husband says he doesn't want that, but does he want you to continue to suffer like this?

A PRN is for occasional use. If you need something regularly, it's got to be prescribed--presumably because a pdoc has thought through what your symptoms will respond to.

I worry about you. A lot. I want you to get the help you need.