Oh ouch, I'm sorry you're feeling this way

I know how terrified I am of slipping back when I've made progress too. And it used to paralyze me, just waiting for the inevitable crash to come again.
What helps me is a couple of things. It helps to think of the ways things are better for me now and make a list in my journal or just in my head of the progress I know is there. Even when I feel the most down now, I know I *CAN* feel better now, that there is something good there. And I go through the 'what is wrong right now' and be as specific as I can. And reason with myself that I have handled that before and how I did. Also it helps to follow my illogical thoughts until they do make me laugh... because I goof up something does not ultimately mean I'm going to end up living in a box.
I don't post a lot but I've read a lot of your posts here and you remind me of me a lot. I know you've made progress, even with the little dips. For me, watching every little thing for signs of falling again was driving me TO do just that. So now I recognize when that starts and argue it down.
Chin up, you can keep up

Slips are ok, they just make the good parts easier to see!