Sugar, honey honey

I am frustrated with myself. I keep having very sabotaging thoughts regarding weight loss:
– I’ve failed
– I’ll never do this
– It’s too hard
– You worked so hard to lose 40 pounds, and you’ve gained it all back and more
– I’m no good
– I give up
I don’t want to give up. I did feel better when I lost weight, but I didn’t reach my goal and got so angry with myself that I am having trouble letting go of the anger and disappointment. I want to believe I can lose weight again, but the thought is just not believable to me. I feel hopeless because of these thoughts, but they are so pervasive I am having trouble managing them. Please help. Where do I start? I thought that in using these tools, I would lose weight for good, but I haven’t managed. Where am I going wrong?