Oh Nino, I know it isn't fun to have the itchies.

Have you checked his coat, can you still see any fleas or flea dirt? If he had a major infestation, maybe one treatment didn't do it?

Don't know what you used for flea treatment; did he have a flea bath? Maybe ANY bath would help, the warm water can sooth and give some relief.

You can soak pawsies in a warm water with Epsom salts solution. That often helps.

Best wishes, and let us know what the vet says!