My ring size varies each day. Today it is so tight that it is uncomfortable. Yesterday it was literally falling off. I need some sort of resizing thing that I can put in and take out myself. I might stop by the jeweler today if I get a chance to see what he says.
My blood pressure is always in the normal range. I thought my finger size had to do with what I ate and the temperature. It always gets tight after I eat out or eat something salty.
Those plastic ring guards might work. They seem like they would be easy to put on or take off each day.
My fingers swell based on the temp as well. But it isn't to the extent you are talking about. I don't take my ring on and off so it isn't a problem-it never feels so loose that I am worried about it falling off.
My fingers do swell and get smaller depending on the temperature, but I never feel like my ring is too tight or too loose. I can just tell that it's fitting a bit differently from day to day. I suppose salt could cause you to bloat though.