a picture would be great.
let me break this down for ya right quick.
your correct about one thing.. sometimes when the plants leafs start to kinda point upwards.. it could be that the plant is thirsty and needs watering.
there's also another reason why cannabis plants do this.. they will do this naturally.. while growing... as it gets ready to spit out another chute and set of branches.. kinda like a butterfly.. (or well, it reminds me of a butterfly..with the way the leafs look when the plant does this). Like, if you've ever watched a plant grow.. on film.. and then speed up the film.. you'll see the "butterfly effect" that I'm talking about.. as the plant is getting ready to spit out a new chute.. of new leafs and branches. In fact, while sped up.. (the film).. you'll see why I call it the "butterfly effect".. because while the film is sped up.. the plant actually looks like its flapping its wings (wings being the leafs).
Anyhow, I could go on and on.. about plant biology and how they work. But I won't.. for one.. my hands are cramping up on me.. and secondly.. there's not enough room here.. for me to explain it all.
But anyhow, nothing to worry about my friend.. but then again.. I can't tell you 100% positive that this is what the plant is doing.. because there isn't a picture of the plant.
But, more than likely.. its one of those two things.
either its thirsty.. or.. its just doing it natural growth cycle.
good luck!
peace.