Sore throat is somewhat normal from my experience and may be tied to your pancreas. There is a good tea out there called throat coat tea and this really helps the throat from my experience more than anything else. It also helps reduce inflammation and heal the gut.
Why do you want to eat olive oil?
For fiber, I would look at buckwheat, oat bran, and teff. You can make breads out of these flours (oat bran and buckwheat can be cooked as a flour or a oatmeal like dish by themselves). Buckwheat comes in 3 forms I know about, the flour, the raw groats (sorta like rice), and cream of buckwheat (sorta like oatmeal).
Sneezing may be and indication of allergies.