I just registered so everyone has to be nice to me
Over the years the best things I've found to help alleviate dizziness is to 1) breathe during every roll 2)doing tekubi shindo undo (wrist shaking exercise) after rolling 3)pressing and holding with the tip of your finger just below your nose where it meets the upper lip. Hold with gentle pressure and take a couple of breaths. I'm not really sure why this helps but it seems to.
BTW the dizziness does get less and less as you get used to it, so maybe the best thing is to keep rolling
Hope this helps,