Being a male myself, the one thing we enjoy is having sex. As far as I can understand your husbands hormones have changed due to which he is unable to make it or feel it. He knows his problem and he would like to correct it too but he will just not talk to you about it due to ego. My suggestion: just tell him you need satisfaction and together go to a good sexologist. There are some injections available in the market which can restore the sex drive men. (It restores it permanently, not like viagra). It's hormone transformation therapy. If you need any help or guidance I can guide in DM.

PS : this is a common problem nowadays and it has a solution so nothing to worry about or to get depressed.