Singularity
First time out of the vault

I'm playing though Fallout for the first time, and just exited The Glow, and keep dying from radiation poisoning.
I didn't want to read any spoilers about the game before I played it, so I didn't remember to take the two prescribed Rad-X before entering. Anyway, once outside, I used my geiger counter and discovered my rad level was above 1000, which I understand is an instant death (though apparently not an immediate death). I then took two rad-x (which I should have taken before) and all my rad-aways, which dropped my radiation level to around 500. I then made sure I was at full health (56) and left the glow.
Exactly 3 1/2 hours after I exit while traveling on the world map, I emerge into open desert and immediatly die, with 0 hitpoints.
My questions are: why does my health not drop incrementally? Did my radiation which passed 1000 set a flag to instakill me in 3 1/2 hours, even if I dropped my rads to below a fatal level?
And, of course...what do I do now? Obviously, if I had a save game before I ever went in, I would have done that, but alas, I do not (which I suppose is another major infraction altogether).
I even tried one of those trainers (I know this part belongs in the modding/hacking forum, but didn't seem relevant) to give myself enough rad-aways to drop my rads to zero, but it STILL kills me 3 1/2 hours later every time...even with my rad resistance at 100% and maxed radiation resistance perks.
Dunno what else to do. Help please...I don't want to start over from the beginning.
I didn't want to read any spoilers about the game before I played it, so I didn't remember to take the two prescribed Rad-X before entering. Anyway, once outside, I used my geiger counter and discovered my rad level was above 1000, which I understand is an instant death (though apparently not an immediate death). I then took two rad-x (which I should have taken before) and all my rad-aways, which dropped my radiation level to around 500. I then made sure I was at full health (56) and left the glow.
Exactly 3 1/2 hours after I exit while traveling on the world map, I emerge into open desert and immediatly die, with 0 hitpoints.
My questions are: why does my health not drop incrementally? Did my radiation which passed 1000 set a flag to instakill me in 3 1/2 hours, even if I dropped my rads to below a fatal level?
And, of course...what do I do now? Obviously, if I had a save game before I ever went in, I would have done that, but alas, I do not (which I suppose is another major infraction altogether).
I even tried one of those trainers (I know this part belongs in the modding/hacking forum, but didn't seem relevant) to give myself enough rad-aways to drop my rads to zero, but it STILL kills me 3 1/2 hours later every time...even with my rad resistance at 100% and maxed radiation resistance perks.
Dunno what else to do. Help please...I don't want to start over from the beginning.