While I read through a similar post written by K.Grayson, I couldn't find a response that overlaps with my case.
In all honesty, I don't know in what way to explain how the situation with my M.Sc. graduate supervisor has escalated to what it has gotten. There are a lot of factors and interference by people who have nothing to do with our problems that muddled communication. Things escalated to a point where I was on the receiving end of a racist declaration from him, at which point a few breaches of my privacy had set me up on a vulnerable path.
My graduate supervisor has actually admitted to some of the abuse and said that he wouldn't do it again with his new students. (At this point, I suspect that someone in the department had found out, ousted his behavior, leading to some disciplinary action.) Unfortunately, by then, my time was up and I had already submitted my thesis, which I later defended successfully.
Leaving the lab, I actually gained nothing more than whom not to work with and whom not to be in the future. As far as my scientific development goes, I gained absolutely nothing, as extreme as that sounds. I figured since my graduate supervisor had at least admitted to some of his mistakes (mainly withholding information and exclusion from project development discussions, grant/article writing, and experiment designing) that he wouldn't stop me from getting that training I had missed somewhere else. I was wrong. In applying to a PhD program in my field, I had asked him if he could write a strong recommendation later (through e-mail) for me, explaining that this is a field I would like to dedicate myself to, and asked if he could be objective despite his personal reservations. He wrote that he would.
I was rejected, unfortunately. I grew suspicious, however, of the rejection. I went back to the previously mentioned e-mail, where he had forwarded the PhD department's request for the letter. (He forwarded the e-mail to me initially to convince me that the deadline was not what I was informing him to be. I sent him a link to the department's website to see for himself that I wasn't lying to him.) In the e-mail there was a link, and I clicked on it and read the letter. I know that what I did was unethical, and there is probably no excuse that I can offer to justify it. I know why I did it and I have come to terms with that. However, now I also know that my graduate supervisor does and will not have my best interest at heart, and thus I cannot trust him. I also know that, given that most of the things that have happened with him would require that witnesses corroborate my experience, I essentially cannot relate what I went through in that lab.
I am currently seeking psychiatric help since the culmination of what happened at that lab has left me cynical, enraged, and depressed. I am also having a hard time with the psychiatrist who suspects that I have gone through a psychotic break that left me delusional. Honestly, I don't want retribution or anything; I just want to move on and continue research in my field of interest. It feels like all doors are closing on me, and I just want a clean break from anything that has to do with him and his influence. Is it even worth staying in the same field? If even a psychiatrist is skeptical that a graduate supervisor would do that, is this uphill battle too steep for me to climb?
Edit: I provided the background info I thought necessary for a stranger to understand my position right now. To clarify my question: what are my chances of getting into and continuing research in the same field considering that: 1. I don't have the primary reference expected by grad schools to be the best source of information on my performance; and 2. I cannot relay what has happened since I am afraid it would be dismissed the same way as with my psychiatrist?
Also, Dawn brings up a good question. How do I go about building new research mentors using a diplomatic approach to discuss my M.Sc. experience?