Fatigue, memory loss, tired eyes (hard to focus), speech, and a dropy eye lid. are these signs of mild sleep apnea or something else?

Many things: The symptoms you have mentioned can be one of many possible diagnoses. Hypothyroidism, lyme disease, cerebrovascular disease, are among the many possibilities.. Please make an appointment with your doctor.

Mercury toxicity : I would suggest. Mercury urine challenge test. Not just a merccury blood test. Find an integrative medical doctor.

Doesn't sound right: Mild sleep apnea shouldn't cause such significant symptoms. I advise you to see a doctor who will do a thorough evaluation.