I wouldn't get too hung up on a bipolar diagnosis if the most thing you are seeing elevated is a surge of energy and positivity. Doesn't sound like it caused you any problems in itself. Perhaps you are just reaching a point where you are finding a more positive, energetic spot at times whereas in your past that just hasn't been your experience? You said you crashed, but how bad was that crash? Was it serious suicidal, dangerous depression? Much depends on the extent of those mood levels. If this has only happened once, perhaps just something to keep an eye on rather than jumping onto the bipolar med wagon (which can create its own issues).