THY3F - advised to have half my thyroid removed but my lymph nodes have become swollen. A&E said they could be infected or that they've grown. What should I do?

Good afternoon, 

I had a biopsy which came back benign, but had to have another one 3 months later which is a THY3F, the consultant has advised to have half my thyroid removed. This week my lymph nodes have become swollen and I have having pain at the back of my ear. I attended A&E today who have said it could be 2 things. I could have infected lymph nodes so he has given me antibiotics, if this hasn’t improved in a couple of days, I need to get back in touch with ent and tell them things have changed. It could be my nodule has grown etc. any advice would be great.