Well, I probably should have known and now I do I will be lifting my lips to see my upper gums when cleaning my teeth!
Long story short, I went into a flare before Christmas that I'd seem to shift then relapse - unusual for me as I have quite a lot of success fending off these flares. I'll be honest here and admit I've felt as though I've been dragged by an HGV since Christmas and now I know why.
Yes, off and on I did have some tooth pain but I didn't pay it much attention as I also have tetchy sinus and tooth pain goes with sinusitis...this morning the tooth pain was close to unbearable and did a quick check of my gums only to discover an abscess tucked way up at the very topmost part - not something I was seeing until I lifted my lips up to get a better look. Oh dear!
Quick call to the dentist and after he got a professional look, he told me that abscess is the likely source of the pericarditis flare both cause and prolongation - bonus, he didn't scold as he's been thinking for some time I probably would lose that tooth (damage from impact trauma, we've been trying to save it for years). Impressions on the 12th, extraction on the 19th.
From this day forward I will be checking my entire gum line every day. I feel a little stupid, I know dental and heart problems go hand-in-hand and should have been doing a thorough daily gum check.