you sound like me ..
You sound like a very similar personality trait to myself and I have been looking for ways to fix this before it happens. I havent entered a poly relationship yet because of the fear of all that you said is happening is going to happen to me. It does have it goods points doesnt it? I mean Master and myself are looking at the other women eventually living with us ...
I hope you feel better soon, I would love to hear back about what works for you