I've had chronic headaches since 2001. At first they were incredibly debilitating, sending me to my bed in a darkened room for hours at a time unable to do anything much. At one stage I was getting them about 4 days out of every 7, and it was affecting work.
It was diagnosed first as chronic tension headache syndrome, then chronic migraine, then a mixture of the two. They did eventually get under control with a mixture of tricyclic anti-depressants and beta blockers; I have sumatriptan as well, which works about 50% of the time. For the last 10 years I've only had the occasional really bad one, maybe one very 6-8 weeks, and I avoid chocolate products high in cocoa.
In the last 4 months, however, they've ramped up again. I'm back to 2 or 3 a week, I'm dropping hours at work (I WFH full time) and when I went on my first appointment in person in 18 months recently, I developed one within the first hour and couldn't concentrate or speak properly.
I spoke to my (new) GP this week and he suggested increasing my tricyclic meds for 4 weeks - I'm only on day four of increasing by half a dose, and now I just have burning diarrhoea AND a headache every day. 
I've no idea why I've suddenly lost control of them and why nothing is working any more, and I'm not convinced by the GPs latest approach although I know I haven't given it long enough. I'm just really fed up, I start an exciting new job in 6 weeks but I'm not working effectively at all.
I'm just venting really, not sure what to do next. I could see a private GP I suppose.