The British fighter was hospitalised for 48 hours following his dramatic victory over Benn last month as he struggled with dehydration but explained that his pain paled in comparison to the man in the next room.
Eubank Jr told 'The Diary of a CEO' podcast: "I was in the hospital, lying in the bed and they had IV drops to get all the liquid into your system. My bladder was full and I needed to pee. For about two hours I would stand over the toilet and it would not go, and I'm dying to go, that's how dehydrated I was, my body wouldn't let any liquid go, it was holding on to everything.
"There were moments in that hospital when I was feeling... I saw myself in the mirror; my face was all puffed up, I had a massive cut across my eye, my headache is crazy. I'm feeling sorry for myself; I've got my family around me, some of them are crying and I'm thinking, 'This is so bad.'"
Eubank Jr admits that he felt "blessed" when he heard about his fellow patient's predicament.
He said: "I'm lying there, I've got my oxygen mask on, I can hear everything that is going on. Somebody gets wheeled into the room next to me, there are no walls, it's just sheers. I'm saying, 'Get me the morphine', but they can't until they sign off on some stuff. Then I hear the doctors saying, 'We have to operate on him now otherwise he's going to die.'
"I heard that from the other room and thought, 'Oh my God, I'm great, I'm blessed, I don't need to feel sorry for myself.' I know I was in pain but there's a guy next to me who's about to die, what am I doing feeling bad for myself?"
Eubank Jr won the fight by unanimous decision and confessed that he had to dig deep to overcome Benn, who he had expected to knock out during the contest.
He explained: "Well, I had to come outside of myself. It became spiritual. It wasn't about the physical. I was dehydrated. I was experiencing all the things that had been restricting me leading up to the fight.
"Should I give up? Should I take a knee? Should I run? No. We are going to war. We are going to leave everything we have in this ring because this fight is gonna be remembered forever. I wasn't willing to go the rest of my life knowing that I didn't give it my all."
