Hi there ~
If you have epigastric pain
with all the rest of the issues that you are diagnosed with, i.e. hypokalemia
and hyperrenninemia, I would think that there is an exacerbation of the tumor
in your glands. I think you need to see a gastroenterologist for further investigation as soon as possible. I am sorry you have to go through all these issues. I hope this works for you.
Take care and have a lovely day!