couple questions. Your wife is mad at you for having an Ebay business and wants a divorce because of that? I don't understand what the issue is. Is it because you didn't discuss it with her first?
Second, and I am not trying to be funny, is it possible your W is bi-polar as well? You mentioned your MIL has Bi=Polar disorder and her actions being from 1 extreme to the other over an ebay business seems extreme.
Hang in there. Heal yourself and detach. Fix yourself...keep reading DR and GAL. Be kind but don't beg. and know your Ws buttons not to push. Instead push the buttons that bring a positive response. Bringing up trusting you again is obviously a sore topic right now...show her you can be trusted . Do as you say and the trust will come back.