I'm miserable! Is this acid reflux?

I'm a 26 year old female who up until 8 months ago had never had a major health issue.  Starting in August of last year, I began to experience some stomach issues.  Nothing that bothersome just some upper abdominal tenderness (breastbone to navel), burping, and some slight bloating issues.  In to October I started feeling some slight nauseousness after eating along with the other symptoms.  It was in October I had my first, what I guess was, a gallbladder attack.  After having 3 of these I had an ultrasound which revealed a gallstone so I had my gallbladder removed in December.  Thought that would solve all of my problems...WRONG!

Now, I'm feeling worse than ever and my doctor thinks it may be due to acid reflux and a possible hiatal hernia.  Haven't had any test done to confirm or deny this.  Took Prilosce for 2 week and then Nexium for a month but stopped those back in mid March.  On to my current symptoms which include: upper abdominal tenderness (breastbone to navel), burping, hiccups, chest discomfort, and back aches.  Even had an episode of shoulder pain after drinking a glass of room temperature water quickly.  I mention the room temperature part because a couple time I think hot or cold food/drink have brought on pain.  Ate an ice cream bar and had chest discomfort for probably an hour.  Drank just one alcoholic beverage and had what felt like a severe cramp in my back.  Sometimes my back will start aching after eating.  Had some soup while it was still not and not only my back, but the back of my neck, started aching. Sometimes these episodes occur at random times.  The chest discomfort is enough to where it is all I can think about while it's happening.  Have had heartburn a couple times as well.  Even my throat is irritated which my doctor thinks may be reflux.  I went to my primary care doc a few days ago because I was starting to think something serious is going on.  He gave me a prescription for Prevacid.

I have an appointment with a gastroenterologist coming up next Tuesday but am wondering in the meantime if you all think this is really acid reflux?  This is giving me a lot of anxiety because I don't know what's going on or when/if I'm going to end up being in pain/discomfort.  This is all I can think about 24/7 which is probably not helping matters.  After 8 months of issues I'm wondering if I will ever get back to feeling good again.  My doctor actually prescribed Hydroxyzine which he said would help with the anxiety and sleep troubles. 

Any advice or insight would be greatly appreciated.  Thanks for taking time to read this.

After battling different symptoms for 8 months now it makes me worry that something serious is going on.  My symptoms seem so random to me that I'm just looking for reassurance that they could be attributed to acid reflux.  It makes me feel better knowing that my symptoms are similar to what other people have been through.

Prior to all of this I'd never had a major health issue.  In fact, the only time I'd even had blood drawn was before my gallbladder surgery, seriously.  That was stressful and now still dealing with issues makes me wonder if I'll ever get back to feeling good again.  The discomfort that I'm feeling only a daily basis makes it hard for me to not obsess over it.