Sorry to hear this. The gasping and waking up tired and unrefreshed sound very much like sleep apnea. This is not something you want to ignore, it puts an incredible amount of physical stress on the body. Guys who snore are more likely to have sleep apnea. Being sleep deprived would certainly explain the short temper as well. Make sure this is mentioned to the doc. He will likely have to recommend another doc, as if it is suspected sleep apnea, the onc won't handle diagnosis and treatment.
Right I/O 4/22/1988
Left I/O 9/17/2003
Tho' much is taken, much abides; and though we are not now that strength which in old days moved earth and heaven; that which we are, we are; one equal temper of heroic hearts, made weak by time and fate, but strong in will; to strive, to seek, to find, and not to yield.