Uh oh. Ate some delicious food, including grapes (high sugar, I know, but so lovely... and I haven't had issues with sugar for awhile.) Then: heart thumping in my chest, back-of-neck-ache tightening, whole body thrumming. I have an app on my phone that measures heart rate, BP, oxygen saturation -- very useful, and readings have been accurate so far in that they are consistent when I feel 'my normal' and get worse when I feel crappy. All these measures are recumbent, propped half-up in bed, not standing much less moving around! BP was 149/96 (Typically mine is low-normal, say 110/75). HR was 111-bpm (Typically mine is normal unless I'm over-exerting. Even when I am, it's in the 90s.) Oxygen saturation had fallen to 94% (Normally 98%, and yes, little differences like this cause symptom shifts in me). I'm very uncomfortable. I can feel my body releasing relaxing chemicals and an attendant decrease in BP and HR; but then it kicks up a bit again before lowering yet further: BP and HR changes: ....basically. This sucks, I still had work to do tonight. Anyone know what gives? The internet is being very dark, saying this is a sign of serious cardiac issues, a severe spike in blood sugar, or a new food allergy. Joy.