Make an appointment with the family doc. If hubby won't go then go without him. Talk to the doc. He may be able to tell hubby he needs to go in for a check up. Depression and other health issues can contribute to lack of sex drive. It can also be from a heart issue, circulation, etc...there are many reasons.
I agree hubby needs a check up and if he would go to counseling it might help. But if it is totally a health issue such as depression then some little antidepressant may make a world of difference.
I will pass on something I read one time. A woman was married and her hubby had an accident and was not able to do intercourse anymore. She was wondering if masturbation was a sin under those conditions. She was told that lust for someone other than the hubby was the worse offense and to consider getting some toys to help her along.
It may be uninteresting to you but once you find the toy that makes everything go WOW then you can get past that need and on to the relationship issues that he may also be feeling. I would also tell him if he is not interested that he could watch you enjoy yourself if he'd like, that might get his fires going.
A friend of mine sells Slumber Party adult items at home parties. She quite her daytime nurse job so she could do the parties full time because she was making almost double the money per year.