Hi @Findingmyway, nice to meet you and welcome to the forum.
I will try to answer your questions from a husbands perspective but this is from my perspective so do not wan't to offend.
I agree with Darcy, I personally would not want my wife to leave during a time like this. (Unfortunately this has been raised over time, but thankfully has not happened). I support my wife who lives with borderline personality disorder and we have our moments where communication could be better. As hard as things can get for us the thought of my darling leaving has hurt and is not something I want to consider. While I do get weary of dealing with our circumstances that does not mean I don't still love her those feelings are directed at the illness not my darling, I would never say I was sick and tired of dealing with my darling, she is totally worth it.
I have to confess that my darling has often felt I have minimised or dismissed her concerns when in my mind I have thought that I have been doing everything necessary to help her. I tend to be a fixer and practice, so by providing a solution or working in the background to create an environment where my darling does not have to worry. Lack of understanding does not necessarily translate to lack of empathy. As Darcy mentioned, guys process things differently to ladies. For me not being able to talk about things has been more about me feeling inadequate in my ability to help my darling.
I have also been guilty of asking my darling if she has taken her meds when she is not coping, this is in the context that when life is getting on top of her she can forget. So again that is the practical and 'helpful' side of me coming out and in no way a reflection on my darlings abilities or my perception of her abilities. It could well be that your hubby is doing the best he knows how to support you and not that he does not value or want to understand you.
All of Darcy, Queenie & Margot's advice above is also most helpful even to me and my situation, particualy the I statements when describing how you feel. If you have any other questions I am more than happy to try and answer them from a husbands point of view.
It is a big step reaching out in a forum like this (well it was for me anyway) but I think you will find everyone here most supportive and helpful. I wish you all the best as you work through this.