How to stop throat clearing?

I have chronic post nasal drip. It’s worse immediately after I eat. (Doesn’t matter what I eat, eatjng always triggers it.) I brought this up to my family doctor and he suggested using a saline nasal spray twice a day. I’ve tried that and it doesn’t improve it by much.

Because of this post nasal drip, I clear my throat a lot. I can prevent the mucus and throat clearning for singing decently by not eating anything less than two hous before I sing, but I still have to clear my throat all of the other time I’m not prepping to sing or actively singing.

I notice I clear my throat even when I probably don’t need to, it’s obviously a habit. How can I break the habit of clearing my throat too much?