Depression? Bipolar? Anxiety? Advice please

Hi all, I am new to forums but feel the need to search for support or friends with the same things going on.

I’ve been married 25 years to my husband with him suffering mental illness since before then. He was involved in a school bus accident as an 7 year old boy, which resulted in the death of his sister, he’s now 50 and maybe counselling treatment was not something available in remote rural areas at that time, but no counselling undertaken.

Long story short, lots of different diagnoses and lots of different medications have been tried with no real long term success.

I just want to know does anyone find with decision making,one day something is a great idea then the very next day that decision is going to be a disaster? And I mean a full blown ‘sink us’ disaster. (And all we are talking about is getting a new second hand car) Hubby can never make any decision and be consistent that his decision was right. And then my days after the event are spent trying to reason with him, and my interest/excitement about said new car are well and truly dashed. Is this a common thing?

Apologies for this long winded post.

Thanks.