anyone has the above condition?

i'm very concern as my son is having inflammation and swelling.

We did a ultra-sound scan at Mt A last friday with pediatrician Dr Terence Tan.
He mentioned it's 'normal', the lymph nodes arise from insect bites, will subside after sometime and prescribe anti-biotics Augmentin for the inflammation.

My son have the runs 3-5 times per day after taking the anti-biotics and i called the clinic to check with the pediatrician but he's not available.
The nurse commented it's normal to have diarrhea after taking the anti-biotics.

But my son is having bad rashes few days after the frequent diarrhea.
Should i continue with the anti-biotics?
My husband suggest bringing baby to see another pediatrician.