I really don't know if me sharing this helps. But if it does, and I hope it does, then great.
My way of coping, at this point, is just doing the work on a routine basis regardless of how I'm 'feeling'. I'm older now and half my lifespan has been wasted away on fear and depression. That hasn't changed, the fear/anxiety part. But if I don't do this work now, I'll never get to do it, you know? No one will know what I've left undrawn.
That's what keeps me going, I guess. I'm going to die one day, it's now a point in time where it's realistically sooner rather then later, and I'd like the ideas that have been hounding me for so long in my head to actually just exist in some way, even if it's "not good enough". It'll never be good enough for me, but that's not the point of doing the work. It's just to get it out there, and to keep getting better with the frighteningly short time that I/We have.
More pratically, since this post sounds more Debbie Downer then I meant it, I thought I'd share a work method I picked up from another artist. KNKL cited a study performed by some warehouse that showed that it got more work out of it's workers that took many small, frequent breaks, then it did from workers that had very few, but longer breaks. To help with productivity I tend to do a lot of work based off that- around 24-26 minutes of "work" and then the 34-36 minutes of the rest of the hour is "play", whatever that entails for you. Alarms are practically required for this, heh.