Dizzyness

I was stage III with 28 days of radiation and 2 rounds of chemo (Cisplatin & 5FU). On December 14th I had MIE surgery and recently completed my 3 month cat scan and all looks good. Besides the normal effects, I have had ongoing random periods where I get dizzy. This started during chemo and still has not gone away. has anyone else experienced this. I cannot pin it down to a specific event. It just comes and sometimes can last a couple of hours. Any feedback would be much appreciated.