Hi. I've Been Having Sharp, Quick Pains In Both Eyes,

Hi. I've been having sharp, quick pains in both eyes, more to my left eye than right. This has been going on for about 1 week. Today for the first time I experienced a sudden partial vision loss. The only thing I saw was a big black ball. It lasted about 10 to 15 seconds. This only happened to the left eye, then it went away gradually. I'm concerned about a detached retina. My eyes are healthy as far as I know.