Everything can feel a little discouraging at five in the morning when you haven't slept! Lots of sympathy to you there. I hope you've managed to get some rest and are feeling a bit more hopeful.
I think it's often tempting to give up when we don't see enough of a change or the going gets rough. I bet you have had classes that have been very difficult while working towards your masters degree but you haven't given up! You've continued on and know that those courses were only a means to an end.
You've done so well with your weight loss! I would encourage you to keep going and push past this stage. Eventually you will see a difference and hopefully feel it as well. What is the alternative?
Stay strong and keep posting so we can encourage you!