I have a similar situation, the congestion, my alergist put me on Nexium and it worked great. Apparently I had some reflux going on, that I did not know about. Tried the nexium for a couple days and whalaa! no more congestion or running nose.

I have a Volcano, my wife gave it to me as a gift for my birthday! (What a woman!) I use far less erb with the volcano than a bowl, joint or bong. I would guess about 1/3 less consumption. I found that I can pack smaller bowls and vape them 2-3 times before they are spent. The left over duff can be ground and vaped again, made into butter or smoked. When you clean the Volcano parts you use ISO Alcohol. Take the "dirty" alcohol, pour in a glass cake pan and let it evaporate, scrape pan and save for a rainy day!