Feeling forsaken by God is a natural and necessary part of our spiritual journeys.
You have permission to feel forsaken!
The fact that the gospel of Matthew quotes Jesus saying this from the cross legitimizes the desperation we can feel.
Remember: the word is not the thing. The idea is not the thing.
So, when our image of God no longer works, we may go through a period of time when we feel that image of God forsakes us.
Beliefs, even beliefs that are insufficient, are very sticky. They can hang on for a very long time. Even after we stop believing them!
But we must travel through these periods to get beyond the language and the ideas.
What Reality lies beyond our words and thoughts? For certainly we mustn't stop there.