I was the same, i avoided all high fat stuff! I went by this out of a book from the British heart foundation i found at our hospital.

Look at labels on food and go by where it says per 100g
FAT 3g or less = low. 3.1-20g = medium and more than 20g is high!

So for example in a typical bag of walkers crisps there are 31.9 g of fat in 100g, so avoid crisps! They are fried in fat after all and your gallbladder, seeing as you have stones, cant produce enough bile to break down the fat.

I avoided crisps, pastry, cheese, chocolate, buttery stuff, fresh cream, pizza, rich cakes, biscuits.... you get the idea.

bonus i lost 9lbs!

Ive since had my gallbladder removed, 4 weeks ago today! If you have to have yours out and there's anything you want to ask, you can message me or ask here.

I'm surprised they haven't suggested you have it out. Unfortunately, once you've had an episode, you're very likely to have more. Gallstones can lead to some health problems down the road, especially if one gets stuck in the common bile duct. You should definitely consult your doctor or a specialist.

There's no method to dissolve gallstones, except for a medication that can slowly (VERY slowly) dissolve cholesterol-based stones. We're talking years. And it doesn't stop new stones from forming.

Thanks for responses. I am having my gallbladder out in a few weeks but need to eat low fat until then.

All the best for your operation, are you coming out the same day like i did? Hope it all goes well : )
Ps make sure you have someone to help you for the first few days : )

Haven't been told details yet but hoping I will be in and out on the same day as I hate being in hospital. Have someone to look after me but hoping I wont be too bad!!

Have you got some loose clothing like tracksuit bottom's? Your going to feel a little bloated and sore and i didn't want anything tight on. If you cant go without a bra under a t shirt get one of those soft belvia ones, its just that the incisions are over your ribs under boobs and i just found it too sore to do up bra and twist it round ! lol
If you want to see where incisions are, i have picture and could copy paste link, its not that gory just white bits of plaster here and there.

Empathy66 has it right.

Nothing friend - only baked, boiled or steamed.
Nothing with a fat content over 5%
No red meat, dairy (although I can tolerate fatfree yoghurt), eggs, chocolate, bread

I think this leaves fish, lean chicken (eating the skin gives you pain), vegetables and most fruit (not oranges), rice, small amounts of pasta

Boring as heck - but it doesnt hurt...