To begin with, if you have concerns that there might actually be something wrong with your esophagus and/or trachea, I suggest you make an appointment with your personal physician, and have this checked-out. I know that it always puts my mind at ease when my own doctor examines me and conducts necessary tests, and gives me the "all clear" sign.
If your physician can't find any problems with your throat, I think that you can pretty much count on the fact that this is your worry and anxiety that are driving these symptoms. At this point, you need to ask yourself what are you you doing to put your worries and anxiety to rest.
Known treatments that work for anxiety include therapy, such as cognitive behavioral therapy (CBT), the use of anti-depressants, exercise, and taking omega 3/fish oil. I am on an anti-depressant, and I just recently started CBT.
Anyone can choke on a piece of food. As for saliva, as long as you don't have a severe neuro-muscular condition, you are not going to choke on your own secretions.
The very best to you, "D"!... Chuck