I used the gammacore as an abortive treatment perhaps 4 times while also using it primarily as a preventative treatment, in all cases it worked just fine and stopped an active attack in about a minute.
I've suffered from episodic CH since 2004. I have a complex etiology with cervicogenic injuries and advanced osteoporosis, too complex for this chat room, I am a one in 20 million patient with rare and complex injuries resulting from trauma.
I take 160,000 IUs of D3 monthly for bone density and do not see a reduction in CH from D3 intake. Too much D3 can destroy your kidneys so you should be monitored closely if taking more than 100,000 IUs of monthly D3 supplements.
When you buy the gammacore you own it outright and can modify it however you wish, they only guarantee it for 30 days of consecutive use once activated and you must activate it within one year or it expires.
The gammacore is not "rocket science," but rather a simple device with 35 individual rheostats on a circuit board that make it look crowded inside. Very simple to bypass the timer shutoff and use manually with an external rheostat device, similar to light switch dimmer, just connect the batteries directly to the transducer electrodes and put the rheostat in-line, drill a small side hole for the wires and reseal the gammacore.
By the way, you can't post pics on this board, 0.49 mb is way too small of a limit or I would post the gammacore internal pics.