Thank you, cheeky'.
It could be the dental extraction was a cause . . . We thought that about my daughter's situation, in which she began having CH attacks after a difficult extraction.* However, it's just as likely that attacks after dental work are caused by the anesthetic that is typically used, xylocaine, which contains epinephrine. I realize that the structural effects of an extraction seem more likely to be lasting than the system effects of an anesthetic. So, like I say, you could well be right about that.
*She had had bad "headaches" before, but they hadn't reached CH-terrible levels. Hadn't even seen a doctor about them. After that, they were bad.
Glad you have it (relatively) under control. If your sumatriptan is injectable, you might consider this advice for splitting injections so you use less but still get fully effective aborts: https://clusterbusters.org/forums/topic/2446-extending-imitrex/
And you might also consider the vitamin D3 regimen that has helped many: http://www.vitamindwiki.com/tiki-download_wiki_attachment.php?attId=7708