Congrats. You could try some gas-x strips, Its what I use and I am a week post op. Having gas pre-op is not too unusual. At least it wasn't for me. Think about all the stuff you used to eat and now you are eating ultra healthy, your body is reacting to the new way of doing things. Any time I change what I am eating, my body takes a while to adjust and does some funny things for a while. You can talk to your Dr's office and mention it to them and try the gas x and see if that helps to resolve it.
Best wishes as you move forward