I agree that it seems like depression. It is really common after any major life event - good or bad stress. In this case, death. I'm sorry for your loss.

I'd recommend therapy and a trip to the doctor. If it makes it easier, call your physician and take this with you to explain. He or she might be able to recommend a psychiatrist or therapist for you as well.

If medication is recommended, I recommend taking it. It doesn't mean you'll be on it forever, but it will make it a whole hell of a lot easier to work through this to get to the non-medicated point.