Back pain sucks

My lower back has been in pain since yesterday morning. It started off as more of a nuisance but then grew progressively worse throughout the day until I nearly passed put out on my bed at 10 o'clock, my thoughts swirling randomly in a blur from the pain, conciousness slowly ebbing away, my heart beating rapidly and a cold sweat forming on my brow. Never again, I thought myself to myself in half-delirium, never again watch "That 70's Show" when your back is out. Laughing had become a bittersweet experience. Well, more bitter than sweet. OK fine, it was just plain bitter. Sigh.
 
I don't know what brought it on. If you know me well, you've probably figured that strenuous activity had nothing to do with it. (Mainly because there was none to be had). And I'm not all that sure sleeping in a bad position caused it either - wouldn't I have felt the effects that moment I got out of bed yesterday? Anyway, I decided to see the doctor today, since I took a sick day from work. (Don't snicker at me, people, when reaching out of bed to hit the snooze on the alarm clock is so painful you wish you bought the farm right there and then, you wouldn't want to go to work either.) The doctor prodded and poked at my back for a few minutes, made me lean from side to side and backwards and forwards, and then informed me that my back muscle was inflammed. When I asked him why, he gave me the a vague explanation that included humidity, not being warm enough when sleeping and bad posture.
 
Not satisfactory at all. I want to know precisely why. I need to know the reason why I can't cough without my back spasming with pain. I have to understand why picking up the phone causes me temporarily paralysis. When trying to put a fresh bedsheet on my mattress reduces me to rolling around on my bed flailing my arms and legs every which way in a concentrated effort to tuck in all the corners because I was unable to bend forward on my feet, I think I have all the right to understand the reason behind the pain.
 
But then again, the doctor prescribed me some drugs to try to make it all go away. Maybe I shouldn't complain.