ankylosing spondylitis
"I have taken 3-4 semi-effective anti-inflammatory medications in the past. Some made me nauseous and dizzy, but Enbrel is the first to make me feel 99% normal. My energy level is much higher than it was. I don't walk around like an old man any more (I'm a 37 year old female) and I can do yoga, aerobics, etc. 
The only side-effect I have noticed is about 10lbs weight gain over the past year, but I am going to work on more exercise/less evening snacking and see if that can keep it in check. At least now I have the energy to exercise when I need to. Before it was too daunting."