Synovial sarcoma, about 6 months after a surgery I experienced the worst pain I'll probably ever feel. They entered the leg in my groin and basically disconnected the leg from the rest of my body by cutting off the blood supply and nerves and shit. Then they pumped my leg with really intense chemo for 5 hours. Making sure that the chemo didn't leak to the rest of my body was extremely important due to the chemo being way too strong and my leg reaching a temperature of 45-46C. I couldn't feel my leg after the surgery and my doctors weren't sure if I'd ever get it back, after 6 months I started to feel again and it was nothing but constant pain. Doctors described it as places in my leg sending signals to my brain telling it "dude this fucking hurts", because of the disconnection those signals never reached the brain causing my leg to send even more signals. When the signals finally got through about 6 months too late, it was constant and overwhelming. Describing the pain is pretty hard, but it felt "pure". The only feeling I felt was pain and I was completely trapped in it. 6 months after the surgery I was also simultaneously on normal chemo and radiation therapy. Blisters in my mouth, throat, all over my body. Extremely intense cramps during the night. Constipated at least once a week. Barely eating while constantly hungry, barely sleeping while constantly tired, barely staying alive. Many more side effects besides those. Not being sure I'd survive another day. Coping with having to quit football and possibly dying. Combining all of these thing and going through all of it the same day, every day for a long time wasn't very pleasant to say the least, especially for a 15 year old. 21 right now and doing alright.