I had it years ago , when I was 18 years old after glandular fever and I have to say I will always remember being told by my doctor it`s a good job he was called out as another would have seen it travel onto my lungs if left and it would be very serious and told me the outcome. So I`m only saying this as it`s worth asking and getting some treatment if a chemist says so.

I may be wrong but just going by what I`ve been told, I fully understand it may have been different to what I had

I hope you get sorted and that the pain eases
Suzanne x