I am concerned for my brother. He s lost 30 pounds in the past 3 weeks. He injured his shoulder a few weeks ago, which may have nothing to do with this, but he developed constant dry mouth. Severly! waking up every hour during the night to drink a whole bottle of water, hitting the bathroom, and back again. He said his only other symptoms are fatigue. He spend the whole day at patient first, and they couldn t find anything. He s going back tomorrow for a blood test.