Re: I Have Felt Tired for Years!
It's possible you could be experiencing what I am, which is Atypical Depression. Do a few searches online for Atypical Depression and see what you think.
Like you, when my exhaustion started, I took a vacation. After being away for 4-5 days, I started feelign better. My energy was back, I could run again and felt great at 6-7 hours of sleep. However, once I came back home and got back into my groove things went back to being exhausted. This, was Feb of 2006. I have yet to find a release from this. I have tried every SSRI on the market, both SNRI's and now Wellbutrin. Nothing seems to work. My next step is an MAOI, possibly provigil.
I would make sure that your doctor tests your thyroid, as well. Another thing you should consider is a sleep study.
Best of luck in your quest to find your "normal self" again!