All the above advice is soooo good, please take heed.
Also remember that yes there is a big emotional upheaval being a donor, but, there is also a hugh chemical change, the anesthetic is a powerful drug that some of us find out we are quite sensitive to. And then the pain relievers after the surgery, and if you were taken off any normal supplements prior to surgery that you might actually need and your body uses to keep its chemisty normal, you can have some very wide mood swings, and energy level changes, until you can resume taking those supplements and getting back to as close as possible your normal daily routine and hours.
I had smell sensitivity, had a hard time eating because of it, stomach upset, couldn't take my supplements for at least 3 weeks because of it, plus, had to take high blood pressure meds after surgery as it spiked really high a couple of days after surgery. So I also was getting used to taking those, and they really knocked me for a loop for about a month. Mornings were pretty much shot as far as having any energy or motivation from taking those, besides recovering from the surgery.
Was I a little depressed, YEAH!, but finding this forum really helped, talking with my buddie helped, and mostly, seeing how great my rehomed kidney was doing in my niece/recipient really helped.
Four months post op, BP is now a very low normal, 112/68 range most of the time. I feel that after the surgery I was soooo pumped full of fluids, off my normal support system of supplements, in pain, lack of sleep because of vitals check at all hours, and no coffee ( couldn't stand the smell, and still don't drink it since surgery) which is a diuretic is mainly the reason it spiked. However, it does run in the family and I was overweight at the time and had very little excercise.
So, all that has changed walking, excercise, proper diet, weight loss, adequate sleep and taking my supplements has got me feeling better mentally and physically than before surgery.
Give it some time, you have had major surgery and need to recover, don't be so impatient or hard on yourself. Eat when hungry, sleep when tired, work when you feel up to it, and don't over do it.