Can’t get passed my Husband relapsed psychosis.

Hi all- sure this all sounds familiar but my husband has had his 4th relapse in 6 years.dx 6 years ago. Been OK for almost 2 years but takes himself off his meds! He believes I make up his psychosis in order to "lock him up". I have two main issues. First is how do I support him when I'm soo hurt? I try to understand it's the mental health and not him, but his delusions related to him believeing I am In love-sleeping around with others and constantly being told this aggressively. I have no interest in that and my 15year old son feels he needs to defends me galore. Hubby has just moved out (again- as he walks out and moves to a second residence when things get too much) which I try not to see as a cop out! and my second issue is-even though I am able to support him physically most of the time, he has been the one going food shopping etc as I have leukaemia and am immune compromised and currently in vic and need to stay isolated as much as possible and am feeling very overwhelmed as I haven't been in public at my usual capability due to COVID for 6 months. I had a major meltdown this morning over the smallest thing. Woolworths opened at 7am and at 6:40 I was in the car park not realising it wasn't 6am opening. I just bawled my eyes out over a shop opening time!!! Ahhhh!!! (this was probably my disappointment that I couldn't even know what time a shop opened and I've been the family shopper pre-COVID for over 30years!!
I care for my 15 and 20 year olds with autism so can't rely on them and have no support as over time I have become isolated from my family and friends due to husbands behaviour.
and even my dogs are siting at the gate whinging first time. I wish I could wave that magic wand and fix everything. Ir that he would atleast get back to the meds-not that they fixed things but made his symptoms less at the least!
i guess I just feel very lost, isolated, disappointed in myself and not sure how much energy I have currently to deal with hubby's behaviour-abuse-aggression-allegations...even though I know I must snap out of it! I wish I didn't care sometimes...