This Necromancy isn't too severe, it's only like a month. I just had the worst experience I have ever had in Nethack. I'm not very good, and the farthest I"ve gotten is DLevel7 or so. I finally had a character I thought might ascend, a samurai. He had everything going for him. He was only level 7, but he had +2 Excalibur, +1 Splint Mail, two rings of regeneration, poison resistance, an amulet of resist poison, and a ring of slow digestion. Since Samurai start with no food, I jumped for joy when I got that ring. I accidentally wielded it(There shouldn't be so many different ways to equip an item...), and before I put it on, went and got a drink. I came back and FORGOT TO FIX IT. I starved to death while wielding a ring of slow digestion. I died a little inside.
EDIT: Another good one. This is when I first felt the wrath of the RNG. I was a Wizard(Named Gargamel, with my cat named Azrael, of course). On the first floor, at level 2, I found a magic lamp, and got a free wish. I wished for Magicbane, and thus sealed my fate. Fifteen minutes later, I was a werejackal, a cannibal, and I had killed Azrael while confused. When I went to kill one of my jackal comrades to eat him(I was starving) I turned into a jackal, and then starved to death. Next time, I'll wish for a ring of slow digestion.