Correct, you don’t shop around for opinions, however one should get a few opinions from gallbladder specialists before getting it removed.
The fact that someone had an attack, does not mean it should be removed, you can avoid getting more attacks by not eating fatty foods and regulating your diet. Doctors suggest surgery because it is the easy way out, however the gallbladder is not an ‘extra’ organ and should not be removed unless absolutely necessary.
Again, I am not suggesting that you not listen to a doctors advice, only that you should schedule an appointment with someone that specializes in gallbladder surgeries.
Having stones on its own, is not yet a sufficient reason for removal, most doctors just look at the sonogram and say oh, you have stones so go for surgery.
Also, ulcers can be mistaken for gall stones, the major difference usually is, that with an ulcer the attack comes way after eating, and with gallstones the attack comes right after eating fatty foods.