Hello I am Dr Ravinder Sharma ENT surgeon
On the basis of information provided it appears that you have a infetion of throat. As there has been not much improvement with the course of antibiotics and steroids
it is advisable to consider other causes like
Do you have history of diabetes?
Have you ever been treated for chronic illness in past ?
The information provided about thyroid gland is inadequate so it will be difficult to comment on this aspect
I would advise you for a ENT and Physician consultation. Further you will ablos require blood tests (CBC, Blood Sugar), X ray
Chest, Thyroid function tests
of neck. The presentation is not characteristic of of mono but it is difficult to rule out on the basis of this information. A clinical examination and test for mono will help in the diagnosis
I hope this answers your concerns. Feel free to contact me if your need more information on this
With warm regards