Definitely, but that doesn't explain the hiding of the friends and him disrespecting your requests to stop texting when you are together.
Does he have any family you could talk to, to say that you are worried about him and maybe they could speak to him as well? Even just to ask if they notice a difference in behavior.

My mother in law has been fantastic in helping me to deal with my husband, whether trying to "influence" him for me or just suggesting ways for me to deal with him better.

i'm glad to hear you are seeing someone regularly and taking meds. All you can control is what you can do for yourself.