You will not feel any pain as you arrive. You will be surrounded by the ones you have killed and they will sing out in a dark melody. Shrieks will emit from those who died more painfully than others.
You will be alone with the ones you've killed, forced to hear the melody of their pain. You will not be harmed physically, you may feel regret or sorrow, but most do not and claim they aren't responsible. Walking on and on, nothing will change, except you will find their faces will slowly rip and tear, leaving their flesh to be seen. Blood will rain from the sky as you cower in fear of what's to happen next.
You will be trapped for all time with them. They will shun you and laugh, as you will be alone in this hellhole. You won't feel anything physical.