If the sufferings of Christ consisted in physical pain alone, then His death was no more painful than that of some of the martyrs. But bodily pain was but a small part of the agony of God’s dear Son. {OFC 209.1}

Isaiah 53:10 Yet it pleased the LORD to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand.

Then whatever that was like, it must have been intense! I suppose it is what the lost will feel when they are on the outside of the New Jerusalem.