Congrats on the weight loss! I had severe gallbladder-like symptoms about a dozen years ago. I couldn't eat ANY fat. I mean ANY. If a 1/4 tsp of olive oil crossed my lips I was in agony for hours. I lived mainly on carrot juice and beet juice for weeks, as any whole food that included the least bit of fat had me ready to shoot myself from the pain. Yet all my gallbladder tests (and other tests, for pancreas, etc) were all perfectly normal.

Anyway, doctors never did determine a cause, as in so many other weird health issues I've had over the years, but I found that if I take milk thistle capsules the pain went away. I took them daily for months and was eventually fine. Then I cut back, but I still keep a bottle around and if I feel the least twinge I take the capsules again and it seems to help.

Sorry about all you have had to deal with. Glad you are on the mend from Covid.