Try not being so hard on yourself and thinking too much.
That is what I do, I think too much and lately I have been coming to the understanding that I need to work though the feelings. My head knows the answers its my heart that struggles.
Its is probably that you are coming to acceptance and along with that I have noticed the grieving becomes more real.... Any relationship has to be morned.... just let your heart do that and in time the head and heart will come together.