Down is an understatement.

KatieJane10x

So just needing a bit of cheering up! I've lost a stone in nearly 6 weeks.. However, I've just had an argument with my sister and she made a comment about how better her body looked compared to mine even though there is now only a few pounds between us. I just feel really low and wondering why I even bother when I thought I was really acieving! Now sat crying like a loser!

ContraryMaryMary

Sounds like your sister is the loser here. I'd say she's rather envious of your weight loss and is feeling threatened by your success. You're doing amazingly well so shrug off her hurtful remarks, congratulate yourself and keep doing what you're doing, cause its working!