I'm glad to hear that your husband is coming around
Sometimes I think it just takes them awhile to 'get it'. When I embarked on my health journey my husband was skeptical at first, but as I learned more and more about what was going on, and talked to him about it (often but not so often that he got sick of hearing it) he started becoming more supportive.
We had arguments at first and I finally got it out of him that the thought of me 'being sick' was scaring him. For awhile after that I didn't talk much about what was going on with me, but as I get closer and closer to a formal diagnosis, the more supportive he becomes.
Just like everything, it's a journey!