Itching is so bad its unbearable?

Perhaps your yeast infection was so bad that you need another course of treatment. That can happen sometimes. Go back to your doctor and ask about it because sometimes it just takes a little more than one lot of treatment especially if you left it ages before getting treated the first time. Also, wear cotton underwear and looser clothing until it's cleared up properly. Shower regularly and don't use perfumed soap down there as this can upset your balance. Use cooler water as hot water can make the itch seem worse. Dry thoroughly and without rubbing if possible. Good luck.