Did the doctors SAY that it's a gallbladder attack that you're having when you go there? Sometimes, people can have those attacks over and over before something is done but, if yours is SO painful, I'm surprised they don't look for something more conclusive. Can't believe they just send you home.
Could be diverticulitis! Similar symptoms with that and VERY painful. I know someone who just had surgery for that after being in the hospital for over a week with the symptoms and pain from that about a month ago.
You asked if it could be diseased if it is your gallbladder. Well, my dad never had a gallbladder attack in his life. Suddenly, one night for the first time, he got this pain. Thought he pulled a muscle. Then it moved from his back to his front and it just hurt all over. ER said it was his gallbladder but x-rays showed no stones. Ultrasound showed no stones. It wasn't until he had a CT-scan that they discovered that the blood supply to his gallbladder had been cut off (for some unknown reason) and his gallbladder was dead from no blood flow and was gangrenous. He was very, very sick then and had to have it removed, gangrene and all and IV antibiotics, etc. Had a high fever then at one point with very high blood count. He is one who can take pain but couldn't take this pain. It was horrible. His skin and the whites of his eyes turned yellow and his urine looked like root beer.
Doesn't sound like you have that (gangrene and dead gallbladder) since you're still here, conscious and asking all of us for help. But, as you are aware, there is SOMETHING absolutely wrong. I don't know how you can constantly be sent home after experiencing those horrible symptoms with no actual, decisive diagnosis. Even if it IS stomach acid irritating my gallbladder, that's not right either and, it's not like they give you some kind of medicine for stomach acid that then makes you feel better so they conclude that's what it is. Doesn't sound right! Sounds like more tests should be done or a specialist called in to find out why you're getting these pains.
Good luck to you. jHope this was the last time and that it doesn't come back again.