Instant death upon leaving Necropolis

Hello, this is my first time posting so I apologize for any errors.

Onto my problem. I am doing my first playthrough of Fallout (through Fallout Fixt basic installation if I remember correctly) and I have just gotten the water chip from necropolis and whenever I try to leave I die during fast travel. I do not know what the issue is, I am not suffering from radiation, addiction, or poison. I have tried:
-Fast traveling to: Vault 13, Vault 15, Shady Sands and the Hub.
-leaving Necropolis from different areas.
-fast traveling intermittently by stopping and entering the wastes to check my character.
-reloading the previous save and reacquiring the water chip.
None of these have worked. The death message changes so I don't think it is radiation. I am afraid I might have to replay the entire necropolis section. Is there anything I can do?

EDIT: I still do not know what caused it, however I reloaded an older save and replayed the necropolis section, that fixed it.