Hi, Brenda
Glad to hear your husband is there to help you. Cheryl has given you some great ideas on things to add to smoothies. Just a couple more ideas:

As swallowing gets more difficult, both texture and acid content may bother you more. Baby / toddler cereals are very smooth and mild for adding calories.

Canned peaches were the easiest fruit for my husband to tolerate at the worst of the radiation.

Everyone is different - chocolate is only just now tasting almost right to my husband. Since you cook from scratch, you will be better able work out food that is, if not tastey, at less annoying. When you develope or purchase a good standby source of nutrition, make sure your husband knows about it AND how much you should be having every day. As Christine pointed out already, the key to getting through this without too much drama is nutrition and hydration. My husband worked through most of his treatment, and I would call him every day to remind him to drink his protein shakes!