Hi there,
I think this is normal, especially if you are feeling anxiety, adrenal hormones can cause "flight or fight" sensations in us, amongst other chemical changes that take place during stress, fear and anxiety.
Some people may have dry mouth, while others may have excess saliva, I have had both at different times, and I must say, it can be annoying. It goes away for most, and can return, especially with what may be taking place in your life at the time.
If you find it becoming bothersome, talk to your doc or pharmacist about it.
I wish you lots of luck.
Sincerely,
DE