I have similar issues. I had hernia repairs yes plural, only had a liquid diet for one month. I lost not one lb.
I have Lupus sle, Chrons which alone should make me under weight.
I have all the oligist as my daughter says. Going to a Hepatologist next week. Liver # off.
Inflammation is a beast, Dr have not beaten.
If you do not have a great insurance plan you will not be referred to specialist. You can change in October. Review your insurance plan. Remember salesmen are paid to get you to change to theirs. They are nice but they work for insurance company.
I am insurance poor but I can pick my Dr.