jedipencil on "500 Internal Sever Error"

I didn't see a recent thread for this...

Everything has been running smoothly, and now as of about 4 or 5 days I keep getting a 500 internal server error every time I try accessing my site. Sometimes it is only while I am signed in to manage the site, but now as of this morning, the site won't load at all, there is ONLY the error message.

I haven't changed anything in the past two weeks, and have removed all unused plugins except for Woocommerce, as I intend to use it shortly.

My site is:

http://www.rabidhorse.com

Is there anything I can try?