HELLO Weight loss is generally seen as a good thing, but it's important you loss weight safely.Anxiety or stress can lead to either weight gain or weight loss, the rreasons could be *Lack of eating *Nervous movement--That means many patiet who are under stress move constantly And so on. In your case You need to control your stress along with healthy eating.There is nothing you can do in short term to regain .But in long term, Fighting your stress is very important along with healthy weight gain