Hey, MsRuthie! Schatzi's right...if you're exercising right now, it should be okay to continue in P1, but if you haven't exercised in a while (even in a couple weeks), it can be hard to add it all in during P1, so I'd do it slowly and listen to your body.
I'm hypoglycemic, and like you, P1 works wonders! But I do okay in P2, as well...so I think the key is to do like Dr. A said and listen to your body. Figure out what starches you can have without it triggering blood sugar swings and stick with that. When you finally get back to 3, if you find yourself tired again, back off on the starches (especially any 'bad carbs' you've included). Okay? Let me know how it goes!