I found sunshine and fresh air did wonders for me when I was feeling down post surgery. I too developed a bit of an infection which got me down as I kind of expected it all to go smoothly and realising there was an infection day 4 post surgery got me really down.
Simply going outside grabbing a bite a sitting in the park or on the beach did wonders. Short walk or simply sitting on a park bench watcjing the world walk by was so relaxing... I think the worst thing is being indoors and on your own...
Now that you are on antibiotics it will clear up quickly - just hang in there :)