why does my eye colour change so much?!

why does my eye colour change so much and its not just small changes either i did have blue eyes, then they went to a light blue, then to hazel, then to light green and then again to bright green and its not everyday change of eye colour they change every few months so the colour that my eye's change to stay's that way for a few months then change's again and also have constant headache's everyday and i have done for the past year, is this to do with my eyes changing colour alot or is it a completely different subject????

Also my eye colour changed about 3-4 weeks ago from a hazel to a bright green and stayed that way till 2 nights ago, i also had'nt had a headache for 3-4 weeks which was great..But Since 2 days ago the headaches are back and also dizziness and my eyes are bright green with a bright blue rim, the bright blue rim is new and its starting to worry me that their could be something wrong..

Can someone help e or has anyone had the same problem???