Yep bro, that's the gist of it, unassuming and exceptionally useful.
And yes the mild headaches add on to the techniques previous damage.
Pretty simply really same again for the next, any questions you have feel free to ask them to.
( Fōsurai ) - Force Lightning
Type: Offensive
Rank: B
Range: Short-Mid
Chakra: 20
Damage: 40
Description: The user, by using expert chakra control, moulds their Keigoku chakra before opening the portal. Through this method, the user creates a "pressure" of chakra behind the closed portal. Then, the user will open the portal within short range of themselves suddenly, letting the foul chakra explode out into the jutsu. The sudden appearance of such pressurized chakra creates a "flash" of chakra bright enough to momentarily blind dojutsu users and sensors (only if their dojutsu/sensor techniques are active). The Keigoku then shoots forward at the target shaped like lightning, causing pain and temporary incapacitation for one turn
Note: The "sensory/dojutsu blinding" effect lasts long enough for the lightning bolt to travel to mid-range and lasts only during said turn.
Excellent, now this technique is pretty much simple too. You allow the pressure to build up behind the closed portal creating the lightning and then you let it out. Im assuming how big you make the portal is up to your imagination? Im thinking star wars in my head though like it coming from your hands, or you can just allow it to be versatile, anywhere short range from you since it doesnt say har:
Me personally I would use this only if I wanted to be sneaky and use some kind of speed powerup and shock someone at close range without much alarm. It should also be used if you mix in a little taijutsu to throw off your opponent to make contact with you. Sorta like a nagashi xD