My suggestion is metal, but if it gives you a headache, well, I'll be surprised.
SKYCLAD!
The later stuff, which is what I recommend to you (albums such as 'Folkemon' and 'The Answer Machine?') is probably only about as heavy as, say, Thin Lizzy. It's awesome, upbeat folk metal. If you enjoy ska, there's no way it can annoy you, and there's basically few songs in the world more energetic and fun than, say, 'Polkageist!', 'Spinning Jenny', 'Great Blow for a Day Job', 'On With Their Heads!' etc.
Unfortunately, they only have one video from the period I'm recommending, and it's not their best song, though it's still awesome and in the period I'm talking about:
Skyclad - Inequality StreetThere's also some other stuff on youtube, a
slideshow with part of Polkageist!, and an older video from a slightly heavier but still amazing period:
Skyclad - Thinking AllowedSpeaking of folk, there's lots of upbeat energetic folky stuff. Try The Whiskey Priests and maybe the Brobdignagian Bards.
Also, Psychobilly
et al. Particularly Batmobile, Nekromantix, The Ghastly Ones, Tiger Army, The Ghastly Ones and the Meteors, though maybe keep away from stuff like The Coffinshakers.
I'd recommend some punk as well, but it might hurt your ears...actually, that's no excuse, listen to New Model Army and Cock Sparrer. At least.
...Also,
ZOMBINA AND THE SKELETONES(Watch the vid till at least a minute in, the song at the starts a joke thing)