Self-care is a good step for today - food and drink. Coming here to ask for help, guidance, someone to vent at or understand is a huge step for today.
I don't know your specific situation, so using mine for what I'm doing to try to help... In those hopes it helps you as well.
I'm dealing with heavy shame, too. I'm trying to get to the source to try to neutralize it, and it's not easy. PTSD fights back to maintain an ugly hold.
I'm trying to change my inner dialogue to arguing with myself instead of a general, "You're totally right, I do suck and am awful and I'm surprised I can even tie my shoes in the morning without help." Convincing myself that the inner critic isn't always right and fighting the gut reaction of agreeing is TOUGH. Asking why it's telling me that and where the core problem/core belief comes from is even tougher... But I won't heal unless I do that.
I'm not always able. Sometimes I stagnate, hours at the computer mindless, not even realizing the sun's gone down and the day's a waste. But... That's a day that I'm still here, and maybe resting mentally for the next battle, the next argument with myself to try to bring myself back to who I was...
Stay with us. Today, tomorrow, and beyond, and work to find yourself and where you need to be now, and where you need to be heading.