awsome! thanks very much for your replies.
eric:
on profiles:
i usually do 2-3 20m dives of up to 2:30, some negatives to 9-10m, 1-2 30m pull-ups of around 2:00. then i start with +40m.
intervalls during warm-ups: 2-3 min for 20m dives, 4-5 min for 30m dives, 10-15 min for +40m dives
tylerz:
last food 3-4 hrs before diving, i avoid caffeine before diving and generally drink a lot. i also take various supplements, mostly to compensate mineral deficits here in egypt.
michael:

. no, i wasn't shooting for the bowl from 5m away.
what is a co2 headache?
herbert:
do you know any symptoms of sea-sickness other than upset stomach, nausea and eventual vomiting? cause that's the only thing i am aware of. still, i was feeling fine until after the last dive.
i checked again some of my dives of the 12 days i mentioned. it all varies pretty much, and there are some days where i would think my n2 uptake was surely greater than what i got on those 2 days that ended with a/m symptoms.
example: one day 4 times 2 min hangs at 30m, another day 5 dives 40-45m with 9-10min intervalls.
2 days ago i did a 40 min warm-up, max 11 m, and one 40m dive only. i regained some confidence, which is already great. i was quite focused on my state of mind during and after the whole dive. i did notice a minor decrease in clearheadedness (i lack a better term) at depth. i would rather blame narcosis for that (on scuba i feel narcosis also relatively early 40-45m). no symptoms whatsoever after surfacing.
i will do similar sessions in the next week and increase depth and will see what happens. or is anyone having another suggestion?
sorry for the long post, but your input is really appreciated.
cheers
roland
