Hi.
I have some strange sensations now and then.
These sensations happen rarely, about 5 or 6 times a month.

First I get dizzy, then some spots start flickering before my eyes that expand until I have difficulties in reading.

After 20-30 minutes I get a mild to medium headache that lasts 2-3 hours.

This happends about 2-3 times per year for the last 3 years.
These moments happen randomly, one time it happened in the disco, one time at home working.

I have to admit I am a computer addict, I sit about 6-8 hours per day on a computer, as a webdesigner, I am obliged to this.

I don't have speech impairmanets, hair loss, balance problems, numbness or loss of memory.

Is this a possible tumour or just an eye problem?

thanks