I'm looking for people like me..

Ni

I'm a FTM and have always been heavier. I gained 20 pounds throughout my pregnancy and since then I've lost 60 pounds. (I'm 5 mpp and breastfeeding) I will be having my thyroid checked because I know that's a common issue but I'm afraid to go shopping because I have a feeling I'll gain it all back once I stop breastfeeding. I've always eaten the same(healthy with some junk food) Has anyone lost a bunch of weight and kept it off?