Update: The weird pinpricking lasted about two days and went away on its own. Tattoo is on track and healing normally. My doc said it was likely some sort of auto-immune response, as I don't seem to be allergic. Not sure if it will happen on future tattoos, since it had never happened to me before.
Never, ever, ever get another tattoo.
You are obsessing over something that isn't there. I have tattooed wrists. The skin is thin. That's how they look. Hacking it up by adding more ink is going to make it worse. LEAVE. IT. ALONE. Do not get another tattoo. Ever.
I definitely understand the exhausting thing, when I go to bed after I've been tattooed I'm out like a light, the shorter the time the less sleep I get but after my recent chest piece that took 5.5 hours I crashed for over 16 hours.