What Causes High Blood Pressure Along With Extra Sleep In An Elderly Person?

My father is 80, took a bad fall last spring resulting in 13 staples in head above the right eye. since then his blood pressure has been higher than normal (the bottom number is consistently in the 90 s or 100) Also he s has more gastrointentinal problems than he had previously. nausea, diarrhea and very lethargic. Sometimes after a solid night s sleep, he sleeps all day. he keeps going back to his GP who prescribes medicine for diarrhea. Nothing more. I m concerned about possible organ damage and that his system isn t eliminating waster efficiently.