I know how you feel. (((So many hugs!!!))) I thought I was doing really well, like I went a whole week without even a single bruise, scratch, bitemark, nothing! And then this terrible, horrible urge hit me like a wave, and well, back down to zero.
If your husband is encouraging you, that is so wonderful! I'm sure he understands your struggle, even if you did SI this time, and I'm sure he will surely still have your back and continue to support you.
I know I'm not any better off than anyone else here, but just keep trying, Onlymedid!