Just recently I have been getting higher and higher back swing it is is really starting to affect me in a bad way.  My speed has increased from about 15.6 to over 18.  My accuracy is really taking a hit I have not been able to hit my mark or even close to it for that matter.  I was just wondering if anyone has had any problem similar to this or has a way to help me correct this thanks for your help.

Well, without seeing you bowl... a couple of things to keep in mind.

1)  Have you been holding the ball higher in your stance lately without realizing it?  Check this the next time you bowl.  If you start the ball higher in your stance, you will generally end up with a higher backswing.

2)  Are you sure you're not "helping" the ball get up to that extra height? (By pulling the ball into the backswing, as opposed to letting gravity dictate the height)

3)  Direction of pushaway?  Has this changed lately?  

Again, there are a few different things that could cause this.  See if any of the above apply next time you bowl.