Your husband is very lucky and he must know this whether he has had hundreds of sexual partners or just one special one.
He tells me all the time he's a lucky guy to have me and it is only when I'm in the part of the depression zone where I feel old and unattractive that I get all those worries.
IF you have back pain, 2 thoughts, make sure you don't have a stomach ulcer - the blood pools in the lower intestines and because you aren't moving at night it is often most painful then. Or chiro. Get the spine all aligned and the muscles will settle down. Does icing it help?
I also notice my physical aches and pains a lot more when I'm depressed. It is a part of the whole package.
Most importantly, though. Trust your own heart. Those odd thots are from your fear and in your heart you know why the two of you are together.