5 weeks postpartum and gaining weight?

I initially lost 20 pounds after giving birth, and have been struggling ever since- I can't loose a pound to save my life, I've actually gained a few. I feel so disgusting and have never hated myself so much in my life. I woke up this morning to new stretch marks all over my thighs. I am not breastfeeding, and I have been watching what I'm eating. I feel so bloated and can't understand why I am not loosing. Anyone else having this problem? I feel like there's no hope for me