My sympathies on your husband's passing.
Could it be something you are eating? I have a guilty pleasure. I LOVE Fritos and french onion dip. I really limit allowing myself to have these in the house because I tend to binge eat them when they are available. Reasons being not only the high fat and calorie content, but also due to the fact that almost always the day after I start eating them I get a feeling like there is a fist sized ball in that area. Like you, it is not really painful, but is uncomfortable and bothersome. A couple of days after the Fritos and dip are gone, the feeling goes away. It's a direct correlation so I know it's the food, which is why I get them less and less frequently now.