The nightmare boss

Imagine you have worked for a company for 10 years on the promise of a better job with a company in the same industry but not a competitor. And the manager who interviewed you seemed really nice. Well thats what happened to me.
I was getting a bit fed up with getting knowhere in the company I worked at. There were redundancies happening and any available vacancies were being filled by those about to be made redundant. I sent a letter en spec to a similar company and a week later got a phone call saying there was a position and was I interested. I couldn't go for an interview for at least a week but they seemed ok with that as I couldn't get time off at short notice. So off I go for the interview, all goes nicely. Have a meeting with the HR department as well plus do one of these psych test things. Then I had another chat with the manager who we shall call Tracey and we really seemed to hit it off. I came out of the interview thinking it went well, then about 2 hours later I got a call from HR offering me the job. I handed my notice in and joined them a month later. Well I knew on the first day I had made a mistake. I had signed a contract saying my position would be one thing and although I was doing some of it, I wasn't doing all of it. I can't say too much as my former colleagues do blog on this site themselves and if they read my industry they might guess its me. But with being the new girl I didn't want to say too much. Some of my new colleagues used to work at the company I had just left so at least I knew some people there. But my manager changed from the lady who interviewed me. She turned into a patronising witch who belittled me and humiliated me at every turn then in the next instant was my best friend advising me on how to handle my personal life - none of which I asked her for. Turns out I was the latest in a long line of people she had done this too but the others had transferred to other departments. Anyway, this job started to make me ill and I am rarely ill. I put up with this for 4 months then it all came to a head before Christmas. I had made enquiries with recruitment agencies in the meantime who had said they would have no trouble placing me even if it was as a freelancer for a while. So when I went back after Christmas vacation I gave my notice. Tracey changed again, was all sweetness and light. I did complain about her to HR when I gave my notice and they said they would deal with her after I left so it didn't make it uncomfortable for me. Thing is Tracey's manager has now tipped her off that I made the complaint and she turned again. Last week she totally humiliated me in front of the whole office and was a total b***h!! Everyone was disgusted with her but because she has been with the company for years, she gets away with it. Or so I thought!!! I was really ill over the weekend and went to see my doctor on Monday. He immediately said I wasn't to go back and he has authorised my sick leave so I don't have to go back before my official leaving date next Friday. I contacted HR and told them, they were very apologetic again. I did say I didn't want to speak to Tracey and they said i wouldn't have to, they would deal with her. Have since had some lovely emails from former colleagues saying they miss me and glad that finally someone has stood up to her. Will keep you posted as to what happens there. So at the moment, I am signed off and now have a poorly daughter, although saying that while posting this she seems to have a new lease of life!!