Am I over reacting or should I go er

I have posted a few times about my son and having a lump. Well today I picked him up from school and he was in tears cause it was hurting so much. He than told me he won't do a poo as it hurts his lump. We just went to his doctor who wants to put him on antibiotics to try and help with the pain. My mum has said to go straight to the hospital.

Am
I over reacting or should I take him. I'm worried about wasting their time he is ok now on my lap now with a warm face washer on the lump.