Thanks guys 
Finishing on willpower describes it pretty well, Chibbi - it was a bit unpleasant

But a great motivation and experience for the next time.
Fug, I'd been using complex salt tablets made especially for endurance sportsmen a few days before the race (the contents looks similar to the S!Caps) and took 2 ampules of liquid salt (esp. high in magnesium) with me to the race - the leaflet for it says 1 ampule per day is maximum - I used up both

It didn't help anyway. Also sucked some carbogel to refuel the energy, didn't help either, it just made my stomach ache. I think it was the hot and very humid weather, other experienced runners said they know it, you get cramps because of the hot and no salt supplement can help you.
I don't know. There was also a 85-km ultra-run starting 3 hrs before the marathon, joining the marathon track then. I'd heard the ultra winner (6.5 hrs) saying that the best thing to avoid cramps and energy loss during the race is to train more

I'll try to stick to this advice, too
