Best to get it checked out as it is a new symptom for you but the one thing that springs to my mind is a migraine. That would account for the kaleidescope thing. Some people dont get the headache and usually the visual symptoms last 10-30 min. some people get nausea, dizzienss, tingling in extremeties or just feel "off".
The vision could also be blurred in that eye simply because that eye isnt perfectly focused anymore and you could have 2 things going on...just to confuse you.
My advice (I am an optometrist) would be to see your GP and describe it as well as you can. Ask him/her whether they think it is worth having an eye exam just to make sure everything is "tickyboo".
Dont worry...scary symptoms....very common though.