As mostly a lurk-only board member, for some reason I just had to reply to this, because it makes me want to cry. (Except the end bit, that smoothie thing sounds awesome.)
Throughout my years of epic yo-yo battling, one thing I've commonly heard when preparing to start over again with dieting after I've lost X-however many pounds and gained them back, is that because there's 100 excess pounds to lose and that's abnormal, that it should really just "fall off" with minimal effort. BITCH, PLEASE. There is just no way to make people understand the way your body can adjust, and CLING to, that extra weight.
In the last 12 months, I have lost and gained back 70 pounds (+10, of course). I was so, so sure it was going to be the last time. I still had about 50 pounds to lose, but I was swimming and doing a bunch of yoga and feeling great. And then - back it came, like a frickin' freight train. And I felt the same way you're describing now...like the road is just so long to finish this thing - to really be DONE with it, that I just can't bear it anymore. I was majorly depressed with no idea what to do until I started researching wls (which I'd previously refused to consider) and started learning about all the benefits and success people have had. My date is now set for May 27th.
Sometimes it just helps to see someone say that it IS legitimately something that requires medical intervention, that you really can't just do it all on your own. It's funny how you can tell yourself something a million times, but it's someone else stating it that makes you stop beating yourself up. Looking forward to further updates.