Rowing with the boss and tetchy at work

I am having some major problems at work at the moment and feel that i am about to end up losing my job. We recently got a new manager (about a year ago) she has no relevant experience or qualifications and it really shows. She is a nice enough person (actually a very nice person outside work) but she cannot manage to save her life. I feel that i am left with only the silly tasks that no one else wants to do and am not fulfilling my job description, i am told by my manager that this is my fault as i should seek out tasks rather than wait to be spoon fed, but how can i do the tasks when i don't know what needs to be done? whenever i ask her for work she either sends me on an errand or gives me her own work which she then claims credit for once i have done it. She makes a huge fuss about small things and won't leave us alone to get on with it.  All this is leading me into a viscious circle of apathy and demotivation. Everyone excluding one new person has a problem with her but i am the only one who complains about her to her face, so she assumes that i am the only one with a problem. I am becoming increasingly tetchy at work and am arguing with her a lot. I think i find it hard to explain to myself exactly what is wrong and decide what i can do about it so i just try to shove it into the back of my head and hope it will go away- which it never does, it always ends up with me losing my rag and then it is percieved that i am the one who is causing the poor morale in the office. I get so frustrated by the situation that, when i am at home i throw things around, bang my head against the wall, hit myself, punch myself, bite myself and even cut myself with razors (I was cutting for other reasons before this as well).I have also done really stupid things on impulse like handing my notice in only to take it back and texting her at gone midnight (which she took as harrassment).When i get annoyed with her i can't seem to care about the consequences,i just say whatever is in my mind. I told myself i could change this behaviour on my own but now, with everyone at the end of the rope with me, i am not so sure.  I have a history of suicidal ideation and have been hospitalised for this on one occassion (but this was nothing to do with work.)Have you got any suggestions to help me feel less moody and to cope with this problem without stapling her tongue to the desk?(or ending up in the loony bin)

[Roger Gould, M.D.]

My suggestion is simple.  You should be seeing a therapist about this work stress, and together figure out a series of things you can try.  You should do this now before you get into psychological trouble..its very important to do it now.

[Enabled]

I two have had a situation at work. I have since been diagnosed with clinical depression and bipolar.  I have all but landed in jail for my financial situation as Florida locks you up if you bounce a check over $100.  I ended up in the hospital 3 times and finally decided with my psychiatrist and other docs that ECT was the way to go or I was going to do something and I hated that feeling as I never knew what it was going to be.  I was having suicidal ideation and went thru a list of medications before I found the right combination.  I feel better but still have my days.  The person discribing herself in this sound like me. I am a nurse of all things and was throwing clipboards across the med room.  I was moody and a few other things.  I didn't realize it. The unfortunate thing was that in having the ECT the only place to have it done was at the facility I was an employee at.  There goes confidentiality.  The surgery schedule has the ECT schedule on it and every nurses station, nurses lounge, doc lounges, etc.  After that my doc suggested I apply for disability which I was able to get. It isn't easy going from a $40K a year to $12 K  It can be humbling as my physical health has declined and I would have had to resign by now.
    Please get yourself into treatment before  you hurt yourself let alone anyone else.  Is there someone you can stay with?  The only adverse thing I can think of is that some people get a whopper of a headache after.  Believe me I resisted as long as I could but it literally saved my life.  Get help as I don't want to see your obituary in the paper.