Welcome to healthcare magic!
The acute tonsillitis
is a hard indication and must be treated in close clinical supervision with broad spectrum antibiotics and mouth care.
If you are having a gastritis
history then you may find them difficult to tolerate.
You should also get the antacid
medicine of PPI class simultaneously.
As the ECG has come normal the chest pain
seems to be related to gastritis only.
You should also get a CBC and a Chest xray done, just to rule out any other possibility.
I hope the advise would be helpful for you.