Hi Marianne,
This may sound a little "off" but have you ever had an optical mirgraine headache? I never had them until after I was given Cisplatin/VP16. Suddenly I would be hit with vision problems - spots bright/dark/strobe lights, focus off, Blind spots,nausea - that type of thing.
I initially only got the weird vision disturbances but never got the actual migraine headache- now occasionally I get the full blown headache (but more times I can ward it off with drugs once I noticed the signs of one coming on). After several mri's of the brain, eyes checked, ears checked they finally figured out I had optical migraines.
Keep us posted,
Wendy