Thank you for the compliments, but it is a whole load of people who post here both present and past who have made this the place it is.
Another headache specialist in Auckland is Dr Rosamund Hill, I saw her a few weeks ago and was most impressed with her headache knowledge. She was great at getting to grip with my complex head / headaches and working on some new options to improve things (other than CH which is under perfect control thanks to D3).
Over the several times I saw Kiri, she went from not including D3 in her options to including it (possibly partially influenced by my suggestions), however when I last saw her was using a 50K iu dose once a month. However the half life of D3 (and what it is metabolized to) are only about 2-3 weeks, so this approach will lead to the D3 related levels being high at the start of the month, then decaying down over the month, potentially to too low a level, before being boosted at the start of the next month.
The approach from Batch has a daily dosing of D3 which will keep the levels much more consistent over the entire month. I follow this approach.
When you purchase D3 in NZ without a prescription you are limited to purchasing tablets of 1000 iu at a maximum, which means both swallowing a lot of pills plus it becomes expensive. This is also a limitation in many countries around the world.
What a lot of people do is to buy them from the US where you can get 5000 iu tablets and at a lower price from places like iherb.com and no doubt others, but the iherb one is often mentioned on here.
If you can get a prescription for D3 to cover tablets through the month, then this will also be worth exploring, although I've not managed this yet...
To complete the recipe in NZ, I also take the ones in this photo - Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

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Watch prices at the pharmacies, they seem to bounce between them being at a high price for a few weeks and then they drop them for a week or two. So just try a few places to find them at the lower prices.
Your GP will be able to write prescriptions for sumatriptan injections which work a whole lot better than the tablets, with them taking around 5 minutes to work. Just ask him for these and if they say they can't (other than for medical reasons), tell them to check with a pharmacy and if that fails, let me know and I can suggest a GP / pharmacy about 10km(ish) away that does.
I'd be hesitant to take 6 50mg sumatriptan tablets unless very well spaced out over 24 hours, with most instructions saying to only take 2 of the 100mg in 24 hours. It is also designed to be swallowed and not chewed.
With having the injections I don't have too much experience of the tablets myself, although I've some on hand in case I ever need them.
Some people have used them as a preventive to give themselves a few hours sleep, but they are not designed to be a preventive.
Verapamil is the standard go to preventive for most people with CH, with many needing 360-480mg a day although some go to 1000mg. This is normally spread out across the day, but this need not be equally. There are also two forms, one is instant release and the other is sustained release. Some people work better with one compared to another. It also takes 7-10 days for a dose change to take effect, so don't expect instant results and keep increasing the dose (which must be done working with your doctor).
Your GP might be reluctant to write a letter for BoC, but do ask, so this might need to be something that Rosamund / Kerri has to do.
As to the other effects CH can have on you, you'll find many posts on this, with a recent one being - Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

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As everyone here knows just what CH is like, which people without CH never have a hope of truly understanding, it is no surprise that it effects our emotions too. The best way to minimise the impacts is by getting your CH under control with effective preventive(s) and abortives. And whilst that does not happen overnight, it can and does happen, as so many of us here can confirm.
If you need further help with this, do work with your doctor and / or the many helplines available in NZ.
I'd not heard of Dean Watson, but from looking at his website their focus is to resolve neck problems as they believe that this is the source of many headaches. Whilst I suspect that this can help many people, I am unsure as to how it will impact someone with CH.
Dr Shevel has been mentioned multiple times on this forum. I suggest you use the search engine at the top of his page to find the posts. This isn't an approach that I ever intend to explore.
Keep reading and you'll learn a lot from so many people.