Mandy,

What ever you do to inform your employer about your cluster headaches, just be aware the results can go either way and have unintended consequences.  There are folks here at CH.com with far more experience in this area.  I would contact E-Double and set up a phone call to go over all the details and options.  He's a behavioral psychologist and makes his living doing things like this.

You also may want to consider the following approach. One method of relating the fact that you suffer from cluster headaches to your employer is to engage in a conversation based on the following logic.  

Ask your supervisor what they would do if you had diabetes instead of cluster headaches, and needed to take a shot of insulin?  If your supervisor's response indicates any level of understanding, tell your supervisor that although the cluster headache disorder is not fatal, an attack must be treated with the same urgency with which a diabetes sufferer takes insulin to prevent going into shock.

If you see even more understanding, show your supervisor the video of Chuck Setzco's cluster headache attack at the following link:

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Make sure your supervisor watches this video with you at that time.  For this video to have a maximum beneficial impact, It's very important your supervisor sees what happens to Chuck while you are standing or seated next to him and ready to answer any questions.

Take care and good luck,

V/R, Batch