Symptoms

Hi everyone, Im almost 20 years old and have moved to Japan.
Iv'e been here for a month now and drank with some friends a week ago, after going to sleep I wake up again at 2 in the morning with a nasty pain. Iv'e never experienced this pain before so I didn't know how to fix it.
It eventually passed over and I thought I was just getting sick or might have drank too much.
Then last night it happened again but I woke up at 4 and was pretty much rolling on the floor in agony for an hour but had no way to stop it. I was too stubborn to call an ambulance too since it would just cost money for me to not be able to explain my symptoms and just be rolling in agony in the hospital.
My relative back in America said it sounds like some type of acid reflux and I decided to come here to see if others feel the same pain im going through.

This pain is where I expect the bottom of my lungs to be, It's not at my stomach and they aren't cramps that appear in increments of time. It's a constant pain. When trying to walk my body will sometimes get extemely cold/ weak and I kindof slump around the place.

Also I just had lunch today and am starting to feel a slight version of the pain from last night.

Is it possible to just have this problem appear suddenly overnight? Im a little stressed out that this is going to effect my eating habits for the rest of my life now.
I'd like to hear some horror stories of you guys' worst experiences with this kind of thing. Thanks in advance (~* U*)~