I am very sorry to hear of the loss of your mother. Also, the cancer diagnosis is one that I am very familiar with and I am sorry that you, your husband and the whole family are traveling down this road. Cancer affects everyone. Please know that you are not alone in these struggles. I hope that you and your husband will find support through this process.
Removing alcohol from the equation will only prove to be a positive. You will be able to deal with your grief over your mother and this illness without masking the problem or making matters worse for yourself or others.
Please keep posting and keep up the good work.
Hugs to you.