It's the untoasted bread that's the problem, because it chews into clumps and that's not helpful when you're healing from Nissen surgery. I love bread and have eaten it without any trouble once I had healed. Just toast your bread for the next couple of months, that's all. You'll pretty much know when you're ready to start untoasted bread, but it'll be one of your later (6-8 weeks) foods.
Your gas pain is a short term problem...especially if you can burp. Some of the gas pain you're feeling could be surgical pain. Don't forget that your swallowing is likely to get worse due to wrap swelling. Peak swelling is generally around the two week mark. If your swallowing starts to get a little funky, just back off to liquids for a few days. Once the swelling recedes a little, you'll be back in business.
Glad you've joined the group!
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”