You might not
feel good, but you
are good. It would be great if you could have both, but if you had to choose, which would you rather? Exactly.
Look at it from another point of view - where is this feeling of being "down" coming from? You had a huge accomplishment, a great step forward (not a single step, but part of a beautiful journey) - hashem is proud of you, you know that for sure. Everyone here is impressed and inspired. So why don't you feel good?
Because the yetzer hora is testing you. If you feel good, it'll be easier to continue. You'll feel better about every time you won. You'll feel good about your life, your relationship with hashem, all the mitzvos you do. But the y"h is trying to take that away by using your voice and lying to you. Don't let him!
Measly? Every second that you resisted gets you access to reward that even the angels cannot imagine. You went 90 days, and you're still going! I'd tell you to buy a bottle of whiskey, but this really isn't the right time of year for that. Maybe find someone who has some nice whiskey that needs getting rid of?