It is possible to get desensitized by using a vibrator, so maybe that is part of the issue.
Just a few thoughts in no particular order:
If you can orgasm by yourself using your hands, can you show him? Most men really enjoy watching their SOs masturbate and it would let him learn what you like.
You can look for a vibrator that is easy for him to use on you while you are having sex. Something small and easy to hold (pocket rocket or similar) might work.
Sex is mostly mental. What do you fantasize about and can you bring your husband into this?
Have you told and shown him what you like in bed? Don't assume he can guess or figure it out.
Has sex become routine - do you make an attempt to keep it fresh and interesting?
If you can have more enjoyable sex with him you might find yourself more enthusiastic about the whole thing.