Thanks for the suggestions and advice!
I agree, it doesn't sound like depression or stress or attitude, and I'd move past those diagnosis (even if the doctor's don't.). It could be CFS. Several symptoms are key ones that fit closely. There things that can help CFS which you can experiment with over time. However, it's not "treatable" so it's important to make sure you don't have someone else that is treatable along the way.
The symptoms that fit are fatigue to the point of exhaustion, exercise makes it worse sometime after the exercise (post-exertional maliase), dizziness, word recall (and other memory and concentration problems), chesst & heart beat weird (can be related), numb body parts that aren't permantently numb, feeling interested in doing things and being frustrated that you can't (is a key difference from depression where apathy rules), muscular fatigue which makes simple tasks like teethbrushing hard to do.
Other areas to consider are - a nutritional imbalance from the eating disorders, or a stomach flora imbalance from them which is causing poor nutritional absorption. Chairi formation at the base of the neck. From accidents, or sometimes it just happens, the cavity there will misalign, cut off blood to brain, and produce something very similar to cfs. An xray evalated by an expert in it can tell and surgery repairs it. Lyme infection from a tick can happen even when it seems completely unlikely and looks like cfs. Thyroid function and thyroid growths have probably already been checked for you.
For the dizziness and chest stuff check out dysautonomias, which are common to cfs, that I mention in earlier posts such as POTS and Neurally mediated hypotension. Long term prognosis is better if early on in the illness you stay very hydrated, so drink a lot of water, and cut back on caffinated drinks and sodas. It all has to do with the dyautonomias. I mention some good website in earlier posts too. (Someone got very mad at me for mentioning these to her, but I did include some good info in my comments, so if you can ignore that debate and just get what's useful to you...)
Congrats on getting past the eatting disorder and depression. CFS can be short term and go away after a couple years. It can also be long term. Hopefully you'll be fine soon, if you take care of yourself, and gather some information, and don't let this stage of things get you down.
Have your physicians tested you for a "pseudotumor"?