How do u counter this, because i often bluff big and take down medium to large sized pots, but now my oponents aren't betting their flush, and checking to me on the river w/ the nuts....
Is there any way to get information by betting, if so how big should the bets be compared to the size of the pot/size of the blinds.
It sounds like you may be too predictable. If they have picked up on the fact that you are bluffing a lot then waiting for a big hand and snapping you off is the correct strategy. You need to adjust by tightening up a bit, and not bluffing as much or pushing your bluffs as far.
As for the amount to bet, I would consistantly bet 3-5 times the big blind, regardless of the strength of your hand (unless you just call of course). That will help keep people from reading your hand based on the size of your bet. On the flop generally bet about the size of the pot. This will usually work as well as an all in if he has no hand, without the risk. And again always betting about the same amount will make your hand hard to read.
If your opponent calls both a pre-flop raise, and a pot size bet on the flop, think hard about firing off another bet. What could he have to stay in? At that point discretion may be the better part of valor. You may want to check and give it up if he bets into you. Don't look at it as a loss, look at it as a saved bet. If you really want to out trick the trickster, you can do that a couple of times, then check the turn when you do have a monster, and turn the tables by raising when he bets into you. I have had success with that ploy a number of times.
Mix it up, bet when you got nothing, conservative players hardly ever win. can wait for cards to come out, just gotta bet at a pot and put others to the test...if they got the guts to play with you. so no matter what you got, just play the player. the he plays at you, play back at him, and you'll catch him with his hand in the cookie jar.