Who cares for the caregiver?

My wife was recently diagnosed as bipolar, but it has been coming on for the last 12 years.  Started noticing the irritibality and depression, but was told I was making it up.  She tried going to the Ob/gyn, did hormones, but no good.  Finally went to a Psych and was on numerous antidepressants until she flipped out and spent two weeks in the hospital.  I am so tired and burned out.  Have started my own antidepressant.  I feel better, but am tired of being "on call" all the time; ready to respond to the next swing, handle the next emergency.  I pad the budget for when the spending sprees happen, and am nervous when she goes shopping.  I feel like a single parent to the kids, but now with a dysfunctional one thrown in, too.  I go to work so I can have adult conversations without all the emotions and unexpected drama.  While I am pleased with the care my wife has gotten, I am disappointed as to the support the caregiver gets.  I am about at the end of my rope, emotionally.  I don't know if this is typical of a BP caregiver's story, but it is my story, so far...