I woke up about a month ago and I wasn't tired, which made me very excited. Since then, life has been finally been going in more of an upwards curve rather than a downwards spiral; a spiral built upon failure after burn-out causing another failure, etc, all because I am always tired and low key, low energy, always have been.
One of the major reasons I have always had a low energy level is because I was born with hypothyroidism, which basically means that your thyroid is ineffective or completely dysfunctional. It's just kaput! As I've had it explained to me as a kid, what the thyroid does is to handle the nutrition stuff in your body; I'm not very good at explaining this stuff because, as much as I do enjoy the concept of biology, I suck at it... unless you really dumb it down for me. (Seriously, there are too many Latin words!)
This is how Wikipedia lists the symptoms anyway: