Hello and welcome to MedHelp's forums. So, your husband is on blood pressure medication or is this prescribed for congestive heart failure? Is it working? Is his BP controlled? Some BP medications can actually cause swelling such as calcium channel blockers. You don't mention that as something he is on. The swelling should be reported to his doctor and he should be examined.
Here is a symptom checker for your husband https://symptomchecker.webmd.com/multiple-symptoms?symptoms=high-blood-pressure|swelling|swelling&symptomids=406|5|5&locations=66|50|62.
My suggestion is to see his doctor to discuss. Congestive heart failure is indeed also associated with swelling.