When does a relationship become too toxic?

Hey ladies,

My husband and I have been together for 10 years, and about 5 yrs in he was diagnosed with ADHD. He was on medication but after 2 years things went downhill suddenly. He started getting really angry, shut himself away, became paranoid about where I was or how long I was gone for etc. We ended up having a HUGE blew and seperated for 6 months. When we reconciled, things began to get back to normal, but my once motivated husband just... stalled. He wouldn't look for work, didnt help around the house and just sat in front of the xbox for 24 hrs a day. He became erratic, massivly paranoid and hidden away. After another series of 'for gods sake DO something' arguments, he finally got a job. Things went great, he loved it, was happier but then after 3 months he broke his hand and wrist, and then he hit his all time low. He hasnt worked since or helped much with the kids or home and left me with a bunch of empty promises.

Now he's gone back to a new psychologist who believes strongly he was wrongly diagnosed and has bipolar disorder. During the appt he agreed to all her stratagies and once we left he became sullen and refused to go to the dr for a reference, buy the aids she suggested at the shops and just said he either leaves me and the kids so we'll all be happier or he does things his way.

Ladies, I'm tired. I work, have a baby and 3 other kids. I do the housework and general running around and I'm TIRED. I love my husband dearly, I know it's not his fault and he's sick, but at what point does a relationship become too toxic? Should I continue to support my beautiful husband or should I walk away before it crumbles to dust because our lives have essentially stalled?