Laz,

good luck to you my friend, however just remember to listen to your body very carefully. It's very typical to get dehydrated during treatment and even more so if you're doing cardio work on top of it.

Headaches are generally a sign of dehydration (it could be a myriad of other things) so just make sure you are in constant communication with your MO and keep both fluids and electrolytes flowing (hydration is much more then just water as you are very aware of I'm sure). You're body will probably start talking louder and louder as treatment goes on and that's typical. Good luck, be safe.

Eric