I spent the morning in hospital having my arm looked at - my elbow became inflamed and extremely painful/tender in the space of about 18 hours (diagnosed as bursitis with possible infection - antibiotics and horse-pill anti-inflammatory prescribed, and I’m starting to feel better already)
Anyway, during the process they took a couple of blood samples for analysis for infection and gout markers - almost immediately after this, I felt nauseated, giddy and clammy, and experienced a sort of buzzing/tingling sensation in both hands.
I’ve only ever had blood taken once before - a couple of years back (that time, it was half a dozen separate little tubes, but still not a big volume in total) and the exact same thing happened then.
And I’ve experienced the same set of symptoms before in the past in other circumstances - as a precursor to fainting (or nearly so).
So what’s going on here? Can it be that losing a few tens of ml of blood dropped my BP enough to make me feel faint? Or is it just an emotional/psychological reaction to losing a bit of blood? (I watched it happen in both cases, but with mild curiosity - no particular fear - and I don’t despise or fear needles, as a general rule - don’t like 'em, but not afraid either).
Why did I nearly faint after having a small amount of blood taken?