My hypo periods in the last couple of years have been like you're describing - the energy, anxiety and irritability/anger without the happiness/euphoria/creativity that I usually love. I'm not sure why this is happening, but it's not fun, and you're not alone in it.

I will often get a lot more done when hypo, but lately it's not because I'm feeling high and energetic - it's almost a reaction to the agitation which then feeds into the agitation even more.