Have you been diagnosed with Clusterheadache? I know many CH sufferers that use oxygen (I even use it myself) with great success.
To get the best effect from O2 you need a non-rebreather mask and you need to use the O2 at a flow rate of 15 litres per minute. The general rule of thumb is to stay on the O2 until the pain has gone and then for a further 5 -10 mins to ensure that it has gone and to prevent a rebound attack.
If you are given a mask with holes in, tape up the holes, do not strap the mask to your face just hold it there with as good a seal as you can. I wish you well with this, please let me know how you get on?
Co-Moderator of the Migraine/Headache Forum