I am not a physician so please consult with your doctors care giver before administering any herbal remedies or teas. But, I will try to offer some guidance, and then you can discuss these herbs and recipes with your care giver.
I am not sure about valerian and how it may interact with any medications your husband is taking, it has sedative type properties, please disucss this with your care giver.
I would also think about chamomile and lavender.... both of these are common herbs, but help to ease tension and stress. I am thinking they may be safer to use than the valerian, but again please check them out with a medical practitioner as I am not sure about drug interactions.
Here are the links on our site for both of those herbs: