I am late piping up here, but I wanted to welcome you to our forum. I'm sorry to hear that your husband hasn't taken the news well. Sometimes the monogamous conditioning is just too strong. He probably feels threatened by polyamory, assuming he'd be replaced if anyone else came into your life.
For the moment, it looks like it will be challenging enough for you, just trying not to feel guilty about feelings you may have for other people. Even if I was a monogamy-only type of guy, I would still tell you that feelings aren't always something you can choose; it's your actions that you have control over. So take some time to figure out what you really want in your life, and if this is a dealbreaker for you.
You should be able to get a lot of emotional support on these boards. I'm glad you're with us.
Love means never having to say, "Put down that meat cleaver!"