Welcome to Just Answer.
I’m sorry to hear about the troubles.
When did it start?
Did you consult doctor?
Did you have any test?
Do you take any medicine?
Is there any previous disease?
There can be a few factors here.
It can be due to excess production of saliva or it can be due to difficulty with swallowing.
Saliva production can be increased during eating.
Some common causes for increased production are reflux, infection, inflammation in the mouth.
Difficulty can arise in swallowing from neuromuscular problem like Parkinson's disease, stroke or from obstruction.Allergy, sinusitis , post nasal drip can also be there.
If you have not got it examined by doctor, I would advise to have one.
Treatment would follow according to the precise cause.
If there’s anything else I can do, please let me know