Help Emergency

Hey everyone. this is my fist time growing and i have a major problem.. growing white widow.. everything looked great till today!! they are in the first week of flowering. when i tested the pH yesterday it was really high for some reason, so i brought it back into the correct range, and then it cript back up again.. so again i fixed.. over night everything went to hell.. one plant is almost completely wilted.. and the rest looklike shit now as well.. so i have changed to just water to flush the plants in hopes that will make things better.. advice is needed please!!

we need more info. such as, hydro or soil? what sort of nutes are you using? what Ph are you running and what Ph does your water come out of the tap? do you have a TDS meter? if so, at what level are you keeping your nute solution at?

p.s. we like pics

using hydro, my nutes are from the Floranova group, have a TDS meter, i keep the pH around 5.7.. i do not use tap water only RO. All my reading were normal till yesterday.. pH was in the high 7's i brought it back down to normal levels and then it spiked again.. so again i brought it down. i also saw that the heat rose.. which is my fault.. to 90F. now i am just using pH adjusted water to flush my plants..

I also waited an extra 2 days before i changed my water out.. do u think its possible they are staving for nutrients??

We Like Pictures, Got Any?? Vv