I recently had nissen fundoplication. when i drink ice water, i feel more bloated than not drinking anything when i eat. is this normal?

Check with surgeon: This can be normal - a nissen tightens up the emptying of the stomach, and eating/drinking anything cold can cause the muscles of the stomach to tense even more, creating a bloated feeling. But you should always let your surgeon know about any discomforts or unusual symptoms after surgery, so they can ensure that you continue to heal well.