eat sugars,I eat Skittles and MM's before and during my tattoo,as well as a good meal right before and pre-hydrate the day before and during the tattoo with water.
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my mix of M&M's and Skittles works great for me,and yes,standing up right after a tattoo is always weird,you are endorphin high at that moment,after a long tattoo like that,I grab my water,relax,breath for a few minutes before anything else.hell,after a 6 hour session I can't even count money ! LOL