what to do next

My mother has suffered from depression for years.  She has been hospitalized for it twice over the last 11 years.  She will do good for a while but then slips back into a serious depressive state.  She will stay in bed for days on end.  My family has depended on me to pretty much "deal with her and the situation" when she gets really bad.  She has been on every medication for depression known to man.  She recently started Abilify which helped so much, then right before Christmas, her counselor was killed in a car accident.  We live in a very rural area and "good" mental health personnel are hard to find.  She has now slipped back into "the darkness" and I don't know what to do.  I am at the end of my rope and can't deal with this anymore.  However, the guilt that will haunt me if something happens may send me into the dark abysis as I also suffer from depression.  Any support, ideas, suggestions would be greatly appreciated.  Thank you for your time and support.