I'm tired all the time, terrible memory loss, trouble finding words, confusion, and many more other symptoms. What could be wrong?

Few things. It could be anything from a medical problem to psychological problem to life stress...However, the few things you should make sure you don't current have are: thyroid problem, adrenal problem, electrolytes abnormalities and most importantly, sleep apnea. See your doctor for a thorough evaluation. Good luck.