Wow! An 820! You are so lucky!
But seriously, sometimes being so ill just kicks the stuffing out of you. Your lack of motivation may definitely be a side effect of being sick. Give it a little time and if it doesn't improve I would think a recheck by the doc might be in order.
Look at it this way, at least you have ventured far enough to get your greeting entered. Mine says, Hello, Let's play! ;-)
I just took the classes for my new 730E have had her since end of March, but these were the first classes I could attend. Learned soooo much!
Take care and be gentle with yourself.