Sorry to hear that your MIL is being that way. You have a good opportunity to really build-up your H by telling him what you said in the 2nd sentence of the 2nd paragraph. Guys always, always love to hear encouraging/re-assuring words from their W on how they handled a situation or that you were proud of them for whatever reason.
You got to pick the right moment to say it but don't let that opportunity get away before too much time has past. He'll appreciate the re-assurance that you noticed how he reacted to your moment of anger.
As far as the MIL, you may want to speak to her about her issues or just let it ride. It's just kind of like....meh. Whatever.
Anyway, hang in there because you're making good strides right now.
Me: 42 WAW: 37 Kids: 0 Separated: 06APR13 M:7 Years, T:10 years WAW states she wants to "move on": 01JUL13 "Courage is the standing army of the soul which keeps it from conquest, pillage, & slavery."