Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
You have probably landed up with an upper respiratory tract
infection. Its going to stay for some time and penicillin is going to take some time. You may also start warm saline gargles and take some voice rest. There is nothing to worry as of now. Also you may take some ant acids like ranitidine
for the burning chest pain
that you are having.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.