The LDLO dose of caffeine is 192mg/kg for humans, making LD50 around 3g. So you're half way there, congratulations! :P Apparently common symptoms of an overdose are agitation, increased heart rate and blood pressure, arrhythmias,
headache and convulsions (duh?), though caffeine toxicity can masquerade itself as bipolar disorder or schiztophrenia. The more you know, eh?

Oh, and congrats on *finally* getting round to posting something on your blog...

I checked the doses when I got back to my room, then monitored my pulse rate to watch for problems...

I will not do that again - :S

"Not do that again" - what, post on your blog? :P heh, you should probably get hold of a pulseox, it'll be easier than trying to count your pulse with your fingers :)

i would legit die if i took that much.