Does anyone share the same chronic cough that I have, it gets much worse at night.?

For quite some time, I have been suffering from a very terrible cough that occurs every three to four months. Anyone and everyone that hear it comment on how bad it sounds. A former boss even told me that it was 'grating' on fellow employees. When I get this cough it lasts anywhere from four days to two or three weeks. It sounds very bronchial, I think, and feels like it comes from deep within my lungs. I rarely cough any mucous up, and for the most part my nose is usually congested at the same time but not always. The discomfort significantly increases at night. As soon as I lay down I go into mive coughing attacks no matter if I lie on my back, side, or stomach. They come on so quickly and it is impossible to physically try to suppress it. It starts with a sort of tickle in the back of my throat then instantly I suck in a bunch of air (which I can't stop from doing) and then I start coughing and it lasts for multiple coughs sometimes up to six or seven. It's a very disatisfying feeling because the force of the cough feels as if it's trying to dislodge something for me to cough up but it never does and I keep coughing because it never 'catches' and successfully transports anything up my throat (which is the best way I can describe it) It gets to the point where I am gagging and dry-heaving and nearly vomiting after a coughing attack and sometimes I lose my breath for a few moments. Humidifiers don't help, cough syrups and sprays only help very temporarily, nasal decongestants help so that I don't have to breathe through my mouth when trying to sleep and the prescribed codeine cough syrup that I sometimes get knocks me out for a while, but both are also very temporary and I usually wake up many times a night. And my condition has gotten increasingly worse, now I am waking up every hour or less to a coughing attack and currently I have not slept more than 5 or 6 hours in two nights. I do not have insurance so I have to go to the Emergency Room and every time I get the same story, that it's either allergies or just a cold. I did get a sample of Advair and Nasonex which seemed to help but at the same time I didn't start taking them til over a week after my cough started so it could have just been timing. I want to know if anyone else out there suffers from a similar cough. There is no wheezing and all doctors have said that my lungs are clear as a bell, which rules out asthma. I do not smoke, though I used to, however this started prior to me picking up smoking. I am 24, and I believe this has been happening since I was about 19. In my late teens I smoked marijuana quite often so perhaps this could be an effect of that? If so, I have never seen anything like it in any of my friends or older people who have been lifetime pot smokers. I just really want to find something to stop my cough. It seems weird that it's on sort of a schedule, though it doesn't really coordinate with the changing of the seasons. If anyone has anything similar please let me know. I've yet to find anyone with the same problem.