It was so bad that even his father burned his back.
His Father did not 'burn his back.'
Jesus felt as though He was firsaken, because Jesus was fully human (while also fully divine), and did have anxiety and doubt. His suffering means nothing to us unless He suffered as we would. That is why we need not be anxious or doubtful, He took those for us.
This all being part of God's plan to offer us salvation, how could He forsake himself?
