I sounds like you have something going on with your kidneys. If you have any sort of fever go and see your doctor immediately.

If not, try doubling the amount of water you are drinking and see if that help you at all. But I'd still suggest seeing a Doctor, just in case!

To edit your weight, click on the profile icon at the top of the page, then click again on the profile idon and it should bring up a page where you can change your stats.

Good lucK