Yeah, that's not healthy for him or you for him to set himself up as the medicine police and you need to be able to say, "No," without repercussions. It's not his business.
Maybe both of you could get couples' counseling or at least both of you get individual counseling. For that matter AA and Al Anon are set up to deal with this kind of dysfunction, too.
Your meds are your business. Sounds like quite a power imbalance in your relationship.