Hello,
Ralph is correct that the snorting of water to clear your ears in scuba is of no use.
In very deep freediving water is inhaled right into the ear to prevent the eustachian tubes being crushed by the high pressures. this is no use in scuba.
ears can be a real pain, check out the forum called
"Ear equalization" there is heaps of info in there.
The method of washing your sinus passages with water does work well for me, and dosen't hurt that much. but the best way is to use good technique, try not to have a cold and blow your nose out well before diving. as I mentioned before there is heaps of stuff in the other forum.
good luck,
Stonie.