I'm a fairly active (walk upwards of two miles a day, but don't run much) 18-year old college student. For the past two years I have had an almost constant feeling that someone has their hand around my throat (right under my chin).
I also occasionally get a feeling that I don't really know how to describe, but I think of it as feeling like the air in my throat is less dense, but I take two or three quick breaths and it goes away.
I don't smoke, but my mother does and has for my whole life. Most of the time when I cough up stuff, it is yellow, even when I don't feel sick.
I don't know if it's relevant, but I have terrible restless legs syndrome. I also am prone to frequent calf cramps and have pulled my calf muscle 3 times in the past few years. I also have had constant headaches for the past six years.