He often gets angry and says hurtful things to me if I try to shine a mirror on things and even give him an inkling of the impact that he has.
I can't be honest about how I feel about our relationship as I get comments akin to 'you've made you bed, you need to lie in it'
He knows just the buttons to press to upset me and make me feel like I am the unreasonable one and not being how a loving partner should be.
Given that you have internalised these narratives, I wonder if it would help you to hear my natural reaction when I reached this part of your post?
I physically recoiled in shock at how he is treating you and the word "whoa" went through my mind. Then I sat here feeling confused thinking "what on earth?" and went back to the top because it didn't make sense. It still doesn't make sense but I needed to read it a second time because it was shocking.
There are two separate issues here: the impact of his mental illness, and the choices he makes in how he treats you.
The mental illness comes with triggers outside his control and difficulties he has to manage. It also brings limitations for your joint life.
He still has the capacity to weigh up and evaluate information about how he chooses to treat you.
If this were just about managing a long term illness then we could talk about respite options, about carer support for you, and so on.
But he's also choosing to use you as an emotional punching bag and that is totally unacceptable. That's not something we can coach you on how to tolerate or fix because it is a choice he is making and not something that ever won't hurt you - it's clearly intended to hurt you.
It is entirely possible to live with long term mental illness without seeking to hurt and emotionally manipulate your spouse. Of course there are positives - there are positives in even the most barbaric of situations - but they don't make his behaviour acceptable.