Doesn't quite sound like bipolar to me. Having mood swings from high to low can be an indicator, but also, when you have felt depressed for a while, it feels good, awesome and strange to feel 'normal'. You almost need to give yourself time to acclimate to being normal again and find a comfort zone. It is like taking the training wheels off a bike. I caution about overreacting too soon and trying to 'fix' these swings or diagnose them. That's not to say you should be aware of them and pay attention to them. Every day life has peaks and valleys. Give your mind a chance to reeducate itself before proclamation and treatment of bipolar. Just my two cents.