Hi Shaz,
I have retired from editorship of the Stomach Issues forum (formerly Shay_LoveYourTummy,) but since the slot hasn't been filled yet I'd be happy to offer my input.
It sounds like there are a few different things going on, here. As for the stomach problems post Novasure (I'm not a big fan of Novasure for many, many reasons) you are spot on with your feelings that the anti-inflammatory drugs are causing your stomach pain. These drugs can and do cause stomach ulcers and bleeding - also antibiotics cause horrible problems with the colon.
So, your diet is most likely not the cause of your problems, but the meds they put you on after your surgery. I am so very sorry you are going through this, Shaz. None of it was/is necessary.
So, what I most highly recommend is that you get to an acupuncturist as soon as you possibly can. Do you have any in your area? In the mean time, it is essential that you get some probiotics into your system to reverse the damage that the antibiotics have caused in your colon. You can get them at health food stores or online. If they are too expensive, the next best thing is yogurt, and lots of it. I have an article here in the Stomach Issues Site archives called "The Hidden Dangers of Antibiotics" - if you are interested, I believe it's under the Conventional Medicine header.
Also, there are on-going threads in the GYN Site about Novasure. A few women have complained of horrible bloating, and as I understand it, blood can build up in the uterus after the procedure. I have posted there twice urging women not to get this procedure, as acupuncture can quickly and easily remedy all uterine problems. A good friend of mine has had horrific periods for 3 years. About a month ago, after her doctor recommended Novasure, I finally convinced her to get acupuncture. She has gone from periods that last for 3 weeks out of every month, down to two days per week. As she continues, they will become normal again. Shaz, I feel so disheartened that so many women believe in what their doctors tell them, and have no idea that there are safe, noninvasive ways to heal the body. But, you can heal now, even after your Novasure. Do consult an acupuncturist soon. My best wishes go out to you.
Shay