Hi @Sister
From what I've read in your previous, you've stood by your brother through thick and thin. You've been so focused on caring for him, I wonder if you've been caring for you too? It concerns and saddens me to hear that you have no enjoyment in your life right now. And it signals to me, that perhaps taking some time out to care for you could be very helpful.
Remember, no one can sort out your brother issues besides him. Sure you can support him, but there's only so much support that you can give, until he takes the reins and take ownership. I like to use the anology of helping someone find their way through a forest. Do you take them by the hand and lead the way even though they want to go a different way to you, drag their heels in the ground, and end up arguing with you. Or do you stand beside them and point out obstacles and options for them? In this, don't forget that you are not responsible for the decisions that he makes.
It might be helpful to consider what your limits are. By this I mean your boundaries - they're essentially for maintaining healthy relationships. It is possible to support someone and not be treated badly, and care for youself by having boundaries. Remember, that you have a right to have boundaries - if you feel like certain behaviour (such as coming home after a bender) is having an impact on you, it is ok to set boundaries and leave the situation to keep yourself emotional safe. Here's another useful link that goes over how you can improve boundaries.
@3forme and @Viv have written about how boundaries have helped their relationships in this discussion.
@SimpleAsThis has shared their thoughts on relationship affected by MI and D&A use. I wonder if they would be able to provide some advice?
Have you considered getting support for yourself? Sometime chatting to someone about what is happening can give you some new perspective and or it can help take a load of chest. GROW runs support groups for anyone affected by MI. I believe @Alessandra1992 might be able to share some information about these groups. Also ARAFMI provides support specifically for carers.
CB