Born with a rare, debilitating glandular disorder, 450-pound Fredericksburg resident Gordon Hotchkiss, 41, helped himself to a fifth serving of mashed potatoes Monday. 'Why, oh, why, was I chosen by God to suffer from this horrible blaaarghmum?' bemoaned the stricken Hotchkiss, helplessly shoveling fistfuls of buttery mashed potatoes into his mouth. 'What have I done to deserve this awful glomphummm?' Hotchkiss' condition, known within medical circles as 'bigfatfuckitis,' also prevents him from using the stairs instead of the elevator to get to his second-floor apartment. 