Scott,

You should not get tired after shooting 15 arrows. It's a typical sign of drawing too much weight. Being new you should get sore muscles, but outright pain and/or cramps in the bicep means too much weight.

You can be in good shape, work out in a gym, or even be a weight lifter, but what happens is that the muscles are pulling in a direction that they are unaccustomed to. I know 60# doesn't sound like much these days, but believe me it can be.

I would suggest backing the bow down at least 5# and 10# would be better. Lay off for a couple weeks altogether. Ice the arm and take some ibuprophin. Try some stretching exercises. And yes, if need be see a doctor if it persists.

When you start shooting again keep it light so your muscles can warm uip without being strained. Add maybe one turn to the limbs each week. No more than one turn. Let your muscles develop memory. And if it shoule be that you can't shoot 60# then so be it.

I'm speaking from experience. I used to shoot high poundage, but due to just getting older, several neck surgeries, and acute muscle loss I'm only able to shoot 45# now, but that's OK. The performance of today's bow still allow for clean kills on deer at that weight. It's not about my ego or testosterone any more. It's about having fun.