Hey Nick,
Welcome to CH.com you've come to the right place. We know what you're going through and the good news is it doesn't need to be that way.
One of the best standards of care recommended treatment strategies has been formulated by a task force from European Federation of Neurological Societies. The recommended treatments for CH can be found at the following link:
Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

Members of this task force are among the world's leading neurologists specializing in the treatment of patients with cluster headache and other trigemino-autonomic cephalgias. They include doctors Evers S, Afra J, Frese A, Goadsby PJ, Linde M, May A, Sandor PS.
I've had the opportunity to meet with Dr. Arne May, Dr. Peter Sandor and Dr. Peter Goadsby to discus the optimum use of oxygen therapy as a cluster headache abortive.
Dr. Sandor lives and works there in Switzerland at the Neurorehabilitation, RehaClinic Bad, Zurzach/Baden, Switzerland. You should be able to contact his practice at the following link:
Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

In the mean time ask your PCP for the lab test for 25(OH)D. This is the serum level metabolite of vitamin D3 that's used to measure its status. The normal reference range for this lab test is 30 to 100 ng/mL, (75 to 250 nmol/L).
So far, nearly every cluster headache sufferer (CH'er) with active CH who has gone in for this lab test has had their results come back indicating a vitamin D3 deficiency, i.e., a 25(OH)D serum concentration ≤ 30 ng/mL, (75 nmol/L).
As CH'ers we need to keep our serum 25(OH)D concentration in a range between 60 and 100 ng/mL, (150 to 250 nmol/L). This will require taking 10,000 IU/day vitamin D3 as a part of the anti-inflammatory regimen.
The following photo illustrates the supplements I take by brand to prevent my CH. I've been pain free since starting this regimen in October of 2010.
Most of these supplements can be ordered over the Internet from iHerb or Amazon as many of them including the 5,000 IU vitamin D3 are not generally available over the counter in Switzerland.
Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

The list of key supplements and doses contained in the photo above are illustrated in the following table:
Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

You can read about this regimen at the following link:
Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

Take care hang in there and please keep us posted.
V/R, Batch