Office Mate - Double

I'm 21y/o male and I need help. I never believed in ghost, or any extraterrestrial or paranormal beings/happenings. Not until I experienced it myself. This is my first experience about ghost, or I don't know what to call it, and I never want to experience something like this again.

Monday, the day before my experience, James (my office mate and childhood friend) and I are on lunch break, chatting like we usually do. He told me that he might not come to work tomorrow because it's his mom's birthday, but he's still uncertain. I always come to work 30 minutes earlier (8:00), but James will always be there earlier than me. We're always the first two to come. We are both new to the company and are used to be early.

Our office is on the ground floor and composed of 6 cells, 3 on left side (wall and washroom) and 3 on the right (window side). Each cell has 2 work stations, but the two cells at the back most have 4 work stations. We are in the 2nd (middle left cell). James's table is on the left near the wall, and mine is in the aisle (hallway side). Between cell 1 and our cell is a walkway going left to the washroom.

And so Tuesday came. I got to the office at 7:45am, bit early than my usual. James was not there and I thought that I got there earlier than him or he decided to take the leave. But I was wrong. I heard footsteps going to the washroom and heard the door opening and closing, I even saw his shadow or so I thought. A minute after, I went in front of the washroom door and I wanted to scare him, I readied to frighten him but more than 5 minutes have passed. I thought he was just taking a dump so I went inside, but he was not there.

I got out of the washroom and James was outside, looking straight at my eyes. My heart raced for a moment because I was so sure that he's still inside for I didn't hear the door opening again. I greeted him good morning and he just said "hey", but he sounded like an old woman, and he rushed inside the washroom. A few seconds after, I followed him inside wanting to ask about her mom's birthday, but he wasn't there. I felt shiver all over my body. Feeling cold feet, I double checked the cubicles but there is no James to be found. I never left the doorstep before coming inside so I know the there is something extremely wrong.

I went back to my table, sat in front of my computer feeling so weak, then a sudden yell coming from the washroom rang my ears. That yell was monstrous, like a shout from the bottom of a well. I couldn't stand, I was overwhelmed, I wanted to get out of that room but I just can't. The yelling won't stop, tears run down my cheek, I was so scared and sobbing like a lost child.

After minutes of crying, the sound stopped, but my tears kept flowing down my cheeks. While I was wiping my tears off, at last, another person got to the office, she saw me, asking why am I crying, I didn't respond, and she just left me and went to the back cell. By the way she sounded, I was certain that she didn't hear that frightening voice. I was relieved that someone is with me in that room. I checked my watch and it was just 7:55am, it felt like forever, then my mobile phone rang and it is a message from James saying that he is taking the leave.

I took the leave today, probably a week leave. I don't know what to do and so I decided to write this up online. I can't post it on facebook for I don't want them to freak out (my friends), and I don't want to look weird. I didn't even tell James or my family about it. I just don't know what to do anymore. I want to quit my job.

Tomorrow, I will go to our church and asked for advice, it would be great if you guys can also give your advice, please.