OP no-one should be left without the option of gallbladder removal, as it's the only way of preventing further attacks.
As PP have said, cholecystitis means your Gb is inflamed and it's common to be treated for that first, as surgery is more risky if you have inflammation and / or infection. But you should still be scheduled for surgery. I wonder if this is still the intention of your consultant as you are to go back in 2 months?
I assume you had an ultrasound scan to determine the thickening / gallstones and so you have a firm diagnosis and symptoms of repeated attacks, you should be on the list. If you aren't confident or experienced dealing with consultants, take someone with you who is. Make sure your GP knows you expect to be progressed. Don't let anyone ignore you.
There's no such thing as a no-fat diet but fat triggers Gb attacks in some, so you're advised to cut down, and importantly to not overeat at one sitting. Some foods also can trigger spasm (as as well as reflux) these include coffee, tomatoes, chocolate and red meats. While you're waiting for surgery, you should adjust your diet to suit your own triggers. Pre-removal, codeine is often prescribed but after surgery it can trigger attacks which feel like the Gb pain (due to sending a sphincter which regulates bile flow into spasm). Buscopan, an anti-spasmodic, often helps with attacks.
FWIW I had my gallbladder removed after 2 attacks and few other symptoms, it was 12 weeks from scan to surgery. All the people I know who have had the same symptoms (all middle-aged women) have had theirs removed in a similar timescale. I'm in Scotland for info. Keep on persisting, you absolutely don't have to live like this.