Monitor problems...please help!

Recently, I've been having problems with my monitor. First off, it's an old Gateway 2000 monitor with model number "EV900." I realize that it's not the best monitor but, when I built my computer, I didn't really have the money to buy one of this size as well as all my other components.
Okay, so now on to what it's been doing...at what seems like random times, the screen will jitter like it's refreshing. It's almost like when I choose the "degauss" option except it's really fast. Until today, it was a rare occurrence...it happened every once in awhile but I could ignore it. Now, it seems to be happening once a minute. I shut the monitor off and then turned it back on and it doesn't appear to be doing it anymore but I'm still nervous about it.

So, is my monitor dying or does anyone possibly know what could be happening? Thanks ahead of time!