I remember being very angry @ 60 days. Different emotions ebb and flow. The winter has been causing me some depression. Early evenings and cold weather. May be normal for you. Especially right now.
I get what you mean by things becoming less interesting too. I described it as being stale. I'm trying to set short term goals for myself to keep me moving up the hill. For every up hill, there's a downhill. It's coming. It's got to be.
Not sure if any of that helps, but I understand what you are feeling.