gastritis

my fahter had blood test and endoscope. this week he is going for CT scan.
report will come out around october.
how does gastritis look like ? may i know ? can it be cured ?
how does stomach cancer patient look like ? are they always week and bedridden ?
when people age, will the white colour of the eyes change ?
sorry to trouble, im too worried ):
thanks for your help too.. much appreciated.