Thanks for your query.
Since your baby is having high grade fever.is irritable and is refusing feeds as well.so i suggest you to get him examined by pediatrician
to rule out any infection and manage accordingly.
He may need basic test as CBC.
In the meantime continue with paracetamol
every 6 hourly,do sponging with tepid water.
Try to give him fluids.
you can massage
his gums gently 2 to 3 time a day.
You can rub ice cubes over gums.
Wishing your baby good health.