hello and welcome to HCM,
Read about your husband having difficulty in swallowing. Since he has already undergone the surgery which is like the last hope and still has not much improvement then he needs to use good lifestyle modifications to aid his swallowing.
avoid spicy, oily and cold
eat food on time and take your time in chewing them properly in little quantity
avoid pain medications (like you rightly mentioned) as they increase the reflux which is the main cause of your husbands condition.
Try doing yoga
and other meditative exercises to improve your swallowing ability
There is a new technique called the bio feedback which is available in some centres, try getting information on the same and use that on him
hope he recovers
Dr Sriram Nathan