Gall Bladder troubles

For the past week or so I've been having really bad chest pain. Not like "I'm having a heart attack!" but more like someone has kicked me in the ribs. My first thought was William is kicking me, but he's no where big enough to be near my ribs.
Then I thought it was my bra - so I got a new, bigger softer one. No dice. It only got worse.
So I thought it might be a chest infection. I had a bad cold a couple weeks back that never really went away 100%. So I called my doctor and they wanted to do a chest x-ray which I said, "ummm... I'm pregnant" and they said, "Call your OBGYN, we can't treat you".
So yesterday I finally decided to go see my OB. I felt so dumb sitting there. It's not like I'm in excruciating pain. It's constant and sometimes incredibly painful, but it's no appendicitis (my appendicitis is the most painful thing I've ever gone through so all other pain gets compared to that).
I told the doctor that I didn't want to be one of those women who call about every little twinge or ache, but it wasn't going away and it seemed to be getting worse so I figured I'd have her look at it.
She poked around at me for a few minutes and determined it's probably my gall bladder.
She turned real serious all of a sudden and told me that she was going to have me have an ultrasound done at Methodist Germantown and set up a surgical consult, just in case. She didn't think it was something caused by my pregnancy, but it's not uncommon for pregnant women to have gallstones and the like.
I was kind of numb. I didn't really know what to say or ask and what I did ask she didn't know because everything depends on how this ultrasound goes. She gave me a special diet for the weekend and Monday morning I check in to the hospital. But if I have an attack over the weekend to go immediately to the ER.
So now, I'm completely freaked out. I'm terrified. I went home and cried and then laid in the bed for hours, depressed.
I'm so scared that I'll have to have surgery and put William at risk, or that they can't do surgery until after he's born and I won't be able to breastfeed or bond with him. I'm terrified that there's nothing they can do and I'll be in pain for the next 4 months. I'm not sure I can handle knowing I'm going to have this pain every day for 4 more months at least. I've been dealing with it ok now because I assumed it would go away soon. Knowing it's not going anywhere is going to make my life awful.
I'm terrified that I'm going ot have an attack and not know it. The doctor said an attack is if I'm in excruciating pain. What's excrutiating? What one persone finds unbearable another might just deal with. The pain never really goes away, but there have been a couple of times where I've been doubled over from it. Is that excruciating? Should I go to the ER then?
I don't know. I'm really scared about all this right now.