Good job msp710 on your decision to try and work this out. Read DB/DR over and over again. The books will help you in being effective with your choice.
Yes, her agreeing to go to marriage counseling then out-of-nowhere your W's anger toward you, can be normal.
In MLC, 'anger' is one of the early stages the MLC spouse goes thru. It may get worse so buckle your seatbelt! You have my best wishes.