TVH: I used to always get that due to allergic sinus. Long term will cause bacteria to grow and cause sinus infection due to the buildup of mucus. Nasal sprays could worsen it too. Not trying to scare you but I once had to go A&E for it. The post nasal drip caused me to have acid reflux that irritated my esophagus and cause it to swell & affect my air flow.
Acupuncture can help relief & reduce the mucus flow. Drink lots of water. Get enough sleep. I always get most 'attacks' when I have insomnia or limited sleep. Lowered immune system.