Hey Nick,
Welcome back and sorry it had to be this way... We know what you're going through and the good news is, it doesn't need to be that way...
It turns out there's a good answer for the rhyme and reason why the CH beast comes out of nowhere and jumps ugly with a stinging head-banger... You're more than likely vitamin D3 deficient.
When you see your doctor, ask for the lab test of your 25(OH)D. This is the first metabolite of vitamin D3 that is used to measure your vitamin D3 status.
If your doctor gives you any static, tell him/her you've been taking large doses of vitamin D3... While there is presently no supporting rationale to cover the expense of this lab test for cluster headache, there is for possible Hypervitaminosis D... (Too much vitamin D) So... It's a little white lie, but it will make sure your insurance covers this lab test so its expense doesn't come out of your pocket...
Data I've collected from over 600 CHers who are taking the anti-inflammatory regimen with 10,000 IU/day vitamin D3, Omega-3 fish oil and the vitamin D3 cofactors is conclusive. All these CHers who went in for the 25(OH)D lab test had their results come back less than 42 ng/mL. The actual statistics from the ongoing survey of 187 CHers taking this regimen... Mean baseline serum 25(OH)D concentration before starting this regimen was 22.8 ng/mL Standard Deviation 9.2, and Min-Max [4-41] That indicates nearly all were vitamin D3 insufficient/deficient...
80 to 90% of the CHers who start this regimen experience a significant reduction in the frequency, severity and duration of their CH from 3 CH/day down to 3 CH/week in the first 30 days... most within the first week... Between 50 and 70% experience a complete cessation of their CH symptoms in the first 30 days.
You can download the latest version of the anti-inflammatory regimen CH preventative treatment protocol at the following link. Be sure to share a copy with your PCP or neurologist... That way you're both singing from the same sheet music about treating your CH.
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You can also scan the following QR code with your smart phone and it will download a pdf copy of the treatment protocol to your phone. The QR Scanner app is free. It takes less than 10 seconds to download and install.
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If you follow the suggested course of action in this treatment protocol, I'm confident you'll be right as rain in short order having sent the CH beast running and out of your life.
If you think I'm blowing smoke, check out some posts by fellow CHers who have started this regimen at the following links... There are hundreds more like this.
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Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

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The "Go To" link with info on all the anti-inflammatory supplements, their doses, drug interactions and contraindications can be found on page 1 of the following link:
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Take care and please keep us posted.
V/R, Batch