I have suffered from strep throat since I was 8 years old - not to give away my age - however, over 30 years.
If your child has a fever, you should take him/her to emergency as soon as possible - or, you can contact your pediatrician.
Otherwise, it's important for your child to drink plenty of fluids (even though it's difficult to swallow) - you can start by giving your child a teaspoon of raw honey - which helps to soothe and comfort the throat - followed by cranberry juice and/or orange juice - (Vitamin C is important). Offer your child honey flavored throat lozenges - or any other such favored flavor - that's for children...if you can find natural herbal lozenges, that is even better.
Offer your child chicken soup, as that kills bacteria - and helps to soothe the throat. Hold off from feeding your child heavy meals for a few days due to the extreme pain and soreness of swallowing.
Plenty of purified drinking water is helpful - flushes out toxins.
You can even offer throat spray - to help soothe and comfort.
You can have your child gargle with warm salt water.....(place a pinch or two of salt in a glass of warm, purified water)....
If you live in a cold climate, be sure to use a scarf about your child's neck/throat area if he/she happens to be outside.
Please consult with your child's physician at your earliest convenience to bring this matter to his/her attention - it's possible the prescription may need to be changed.
My prayers and thoughts are with your child -
Please take care.
Peace, Love & Happiness,
The Mystic Wave