During the last two months of life, Dorothy Glas endured so many blood tests her thin arms turned black and blue. The 85-year-old woman submitted to probes of her abdomen. Radiologists scanned her brain, kidneys, thyroid and heart. A psychiatrist screened her for depression. "My mother told him, 'Of course I'm depressed! I'm dying. How can you be happy?'" said her daughter, Meredith Snedeker of Hamilton Square. Glas withered to 80 pounds from an intestinal infection and, after a fall, entered the hospital in July for the final time, complaining of dizziness and a cut foot. The medicine revved up...