Update: still feeling fine. No other symptoms. Worked out as normal. Nothing to worry about, it would seem.

[Tentacles grow out of back]

Neat!

Sometimes when I get stressed I half-imagine spiky, blade-like appendages bursting from my back. It's more of a feeling than an image. 

Today has been busy. Spikes, activate! Prickle powers, go! Jabby stabbies, erupt!

Hmm...doesn't seem to work on command.