47wife/53husband drug/health issues ruining marriage

Hi, When I met my my SO, I knew he had been in jail for heroin addiction but when I met him in 1996 he was clean and sober. I married him in 1998 and things were fine until I found him shooting up in 2008. After that I really lost a lot of respect for him. After a lot of ups and downs he has finally gotten himself on a suboxone regimen so I'm happy for that.

There's been a lot of strife the last couple of years (lost our house, bad credit etc) and I find that the flaws you overlook when you're in love are beginning to wear down my "mountain of love". He can be awfully immature (especially when he doesn't get his way). I feel like I'm married to a 4yr old. I take care of everything. He goes to work and band practice. I freelance and I make a good hourly wage but since I work from home a lot, it's like people we know think I don't work. All I ask is he give me some of his paycheck come Friday. Financially it's tough, I go through a feast or famine cycle with my job. He has a steady paycheck but he doesn't make a whole lot.

Now the last part is tough. He also has diabetes and ED so I feel really frustrated. I want to leave but I can't support myself and (our son) without his financial help. I'm pushing 50 and I have no retirement, no house, no security. Am I having a mid-life crisis? Or should I cut and run before I get dragged down more and more?