I feel horrible. Me and my husband have committed a huge sin.
That sounds like a lot of stress. Is there anything I can do to help with regards to your sin?
You can't help. No one can.
It's reasonable to feel bad after you've done something that you know is wrong, but you shouldn't beat yourself up about it. As long as you and your husband learn from your mistakes and try to do better in the future then you shouldn't dwell on it.
I will never forgive myself for this and I am going to hurt my husband for this sin.
This is not the way. Whatever you have done seems to be affecting you seriously and the consequences of letting this get worse will be dire.  You should seek out help and support immediately to alleviate your stressful situation.