why stress over it ? if it is blowout(which is common) then there is not a lot you can do about it ,so don't stress and worry,
stop looking at it with a magnifying glass and be happy with your tattoo,
relax,let it heal,and move on to the next amazing tattoo.
that took me by such surprise the first time as well. My first tattoo was a large piece and I did not expect such a toll taken on my mind/body once the endorphin rush and adrenaline wore away. I honestly felt like I had the flu.
I felt similar but not as bad when my back was outlined, but after my 5 hours last night I feel fine today... so who knows.