I ended up taking a day off today, after 3 days of biking to work when I got home last night I could feel I needed rest. I was just absolutely done, nothing left in me!
Strangely enough, I was able to go up a couple of steep hills even though I was very tired. I kind of feel it is more about technique than strength when you need to go uphill.
I am going to recover this weekend and will be back at it on Monday. I already miss my bike