No, CTS is in the hands, in particular, the wrist, palm,the thumb, fore and middle finger area. It is a reduced motion/power, as well as a tingling similar to pins and needles.
CTS symptoms would sort of be present all the time in some form, not really come and go as a shooting pain.
A pain in the forearm going towards the elbow can be many things, but without the sensations I mentioned it is not CTS as such.
If your routine has changed, more practice, then It may be as a result of this.
Try warming up and warming down before and after playing, introduce some stretches, and monitor your use.
It is common place to have a neuropathy (a nerve in-flame for any number of reasons) and see it go away on its own.
For musicians because the focus is the hands, we tend to relate this to our own hand use, and believe it is because of what we do, that maybe it is to blame.
Use the ice, and some anti-inflammatory tablets for a few days, give it a rest if you can, introduce some stretches and warm ups and see how it holds up.
If the symptoms become consistant you really do need to see a doctor....insurance or not.
Here is a link to some stretches, and you will find good CTS info in the stickies at the top of the Techniques Page as well as in the Health related sticky
Hand Stretches and Exercises for warm ups/downs http://www.youtube.com/watch?v=C_FZichHw1w&sns=em