Congrats on four days. That is great. I am posting to lend support but can't really give any tips from my own experience as my husband and I met in treatment. I would say that it is harder to do without support so I guess I would tell your husband that you aren't comfortable with the affect alcohol has on you, you don't want to continue drinking alcohol, you are having some trouble with it and would love his support. Then explain how he can be supportive to you.
I think it is best to be honest and open with him. If you don't tell him about this you may be giving yourself an escape hatch to work back into drinking. So is it fear of his reaction to the idea that you might be a problem drinker or fear that if you tell him you will have to stick with being sober because now he knows or is it a bit of both?
Something to think about. And again, great on four days.