So here i am, with ambient light...trying to get a macro shot on a spider.

Without flash, its impossible to get a focus on this windy day considering more than a 3 second shot....

With flash...i get overexposure. Reduced to the minimum aperture of 22, ISO 100....still, overexposure. I cant seem to get the shutter speed beyond 1/180.

Then, while i was toying around with the camera, i found out that when i turn the flash off, shutter speed goes all the way to 1/8000.

But then of course, it is way too dark.
Why? Why is it that when i need the shutter speed to go faster to compensate for the flash, it limits it to 180? is there a menu i should be fiddling with on my K200D?
Some help would be appreciated. I am not sure how the mechanic goes, but it seems counterintuitive to me that shutter speed is limited when flash is on...
Cheers!