Yes I do have insomnia problems too, but have a fibromyalgia diagnosis (not that I'm dropping to bit or anything...
) sleep problems are all part of FM, so I couldn't say if I've noticed any link with the cluster headaches, as I can have sleep problems anyway - if that makes sense
It would depend on what was/if anything was wrong with you're Sinuses, as to whether or not you'd have other symptoms & the nasal stuffiness etc can be part of the cluster headaches too - but the headache is very similar, so its certainly worth asking about seeing an ENT - other Sinus things could be dizziness, earache, headache worse on bending forward, puffy face/eyes/nose on a morning, cough on lying down etc etc
Also might be worth a go - I have a male friend, he was diagnosed with Cluster Headaches years ago, he's an IT specialist so with his work it was a nightmare & little or no help from his GP - on the advice of another friend - he saw an alternative therapist who told him to take a table spoon of cider vinegar in a glass of water 3 times a day - if you knew this Guy you would see the funny side of that, as he really wouldn't believe in it, I remember him moaning it was a rip off - he did try it though & it actually worked for him - he's not had 1 in years - so might be worth a go - sadly didn't work for me though :(
& yes the yogic breathing thing is a God send with pain, you might want to look into Clary Sage aromatherapy oil to use with that too - its got me through a few bad sessions
I'm not good with medications, tend to react badly to a lot of them, imigram included, so I've been referred to a pain management clinic hopefully for NHS acupuncture & MLD - which I have found helpful in the past - so also might be woth you asking about (I find my GP doesn't offer any thing unless I ask for it
)