I fail tests

I feel like lately my happiness and patience has been tested to its limits. This last year I have been put in situations I never thought I would face, or at least not this early in my life. I mingled through life with lots of friends, and anywhere I went it seemed like people always surrounded me. Lately, I just cant seem to get along with ANYONE! Today for example I got in an argument with this girl from work. We exchanged words and now I am worried my job is on the line. This has not been the only time that my buttons have been pushed by a co-worker. My fuse is short. Normally I am patient and can just put things behind me. I feel like maybe I have been doing that for too long. This is me standing up for myself and not letting others walk all over me. I wish I could keep my lid shut rather than going off on a tangent, but I just can't seem to do that anymore.
I have tried turning to God for some guidance on my resentment with work but I feel like the drive just isn't there. Perhaps I feel like there is no up when I am down? I wish I could easily move on from a place where I am not completely satisfied, but it is not that simple. I get stuck in a routine and now I am at a road block that has me choosing left or right? Diagonal or straight? I could go this way or that. I am still trying to figure out what I want from this life, but when I think about it, I get frustrated and then try to think of something else, telling myself that I will think about it later. Kind of like a chore or a list of something to do (I write LOTS of "to-do"/"to-buy" lists)
I am stuck on when and if I should go back to school. And if so for what? I could pick up where i left off of from journalism, or I was thinking about working for a radio station. I know I would LOVE something like that. Or do I go in a direction that is least favored, but something that the economy will need such as nursing. I have a lot to decide and a lot to think about. I will keep you informed on my decision.