Many thanks to you both! I tried oxygen on my last cluster (about 6 years ago), but I didn't notice a difference. Think I'll go back to Dr and ask to try it again though, and will look into sumatriptan injections. Trying to get through them without meds because I don't want rebounds, but it's excruciating and sometimes I just need the drugs! Have started D3 regimen today. Thanks again for your help, much appreciated, from Australia :)