I Have A Lot Of Saliva. It's Always Been An

I have a lot of saliva. It's always been an issue when I am anxious like at the dentist. Now I notice I have it often enough during the day I feel like I am swallowing a lot more and sometimes get the feeling I'm choking from it running down my throat. When I lay down at night to sleep I kind of fight it and post nasal drip until I go to sleep after taking a Benedryl. While brushing my teeth it just runs out my mouth.
Is this much saliva normal?