My post nasal drip also started when I was 18/19, I am 30 now and still suffer with it, sorry to say that to you I wish I could give good news of a cure or something like that, maybe you will be luckier than I am in finding one?
Mine is also quite severe like yours, spitting every few minutes, more severe in morning as it has accumulated overnight and needs clearing off chest making me vomit etc!
I do however manage to lead a fairly normal life and I have a good job, wife, child and as much of a social life as marriage and kids allows
I have tried a lot of things over the years... nasal irrigation, stomach surgery to correct acid reflux, deviated septum surgery, removal of silver (mercury) fillings and mercury detox, anithistamines and nasal steroid sprays, candida elimination dies and supplements, vitamins, NAC etc.. the list goes on!
The very basic things that I do to manage my condition and live a normal life are as follows:
1. Drink lots of water to help thin mucus and flush throat
2. Have a constant supply of tissue to hand and spit all mucus into tissue, letting it accumulate causes gagging, coughing and vomiting reflexes and having to run to nearest bathroom! Keep clearing it up dont ever swallow it back if you can avoid it.
3. The cough sweet that I can't live without... "Lockets"... you may or may not know of them depending on where you are from, but they are cough sweets here in UK, I've tried other cough sweets and none work like these... the extra strong ones are the best, they basically thin down and cut through the mucus in my throat reducing the thickness and severity of it, they also clear sinuses a little bit with the menthol in them, they are not a cure by any stretch of the imagination but they make a big difference to me in symptom reduction! Especially helpful in mornings when its at its worst.
My experience of post nasal drip is about
symptom management and reduction, preparation is key, before going out have a supply of tissues for spitting into, its a bit embarrassing sometimes but people who know you wont care and people who dont you can disguise it like you are blowing your nose, it becomes a skill in discretion! And have a pack of "lockets" in your pocket always. Recognise the signs of mucus accumulation and head to a toilet and cough it up early, have a bottle of still mineral water to hand and the combination of those 3 things have made my life much easier. I can do the things most others can do, it just takes a bit more effort and like I say, preparation is key!!!
I hope you find a way to manage the illness like I have, its not pleasant, but you do get used to it and can live a normal life. Keep eating well, lots of fresh fruit and veg, look after yourself, and stay positive!