hello and welcome to HCM,
You are most likely to be suffering from an acute episode of
Pharyngitis. You need to do the following as soon as possible:
1. Get an ENT consult and consider starting another antibiotic with pain killer as you have been having symptoms for four days without much improvement when it should have become much better. And anyway
Erythromycin is a very weak and outdated antibiotics. Do not worry about your
allergy to penicillin though you must mention that to your doctor as there are many alternatives.
2. Request your doctor for a throat swab and send it for culture and sensitivity
3. Start anti reflux treatment also in consultation with your doctor
4. Take only warm fluids and do salt water gargle
5. Do not speak loudly or strain when you speak
5. Assess whether you need injections for faster and better symptom control
take care
Dr Sriram Nathan