Why was i preacribed fluner 10mg for dizziness ?? Anyone knows

Fluner 10mg is Flunerazine 10 mg. Flunerazine is used to prevent migraine attacks. Many times migraine does not present as headache and may have other presentations like dizziness. Hence it is prescribed to you.

It is indicated for migraines and for vertigo, among other things.
http://en.wikipedia.org/wiki/Flunarizine

Migraines can also cause people to see "auras" (flashes) and cause dizziness perhaps.

here's a novel idea...try asking your doctor who prescribed you 10mg of fluner