i had a really bad cough in college, that just wouldn't go away, I had it for like about a month or so, I would go to bed at night, and it would be worse when i lied down. and it seemed to weaken my ability to breathe right.
so after that went away, i started having tightness in my back/spine for a while. then after that went away i started having trouble breathing or trouble taking a deep breath, it seemed like i had soo much pressure when itook a deep breath, which is usually what a deep breath is, that in response to that my back would crack and I would loss all the energy that just built up. so now i am getting fatigued and tired as a direct result of lost energy.