Hi there ~
I understand your concerns. It seems like you have been suffering from a lot of neck and back problems, obesity and hernia
along with GERD, osteoarthritis
for a while now. I think that with reducing your weight you will be able to get all the issues that you are facing down to a level where you can tolerate them. The low potassium level is probably the reason for your T wave
abnormality and it is useless to ask for a test and find something abnormal and crib over it or get anxious. I hope you get on the path of recovery by motivating yourself to reduce your weight so as to help with your other conditions.
I hope this helps. Take care and have a lovely day!