Is it dangerous to focus on ticks from childhood during meditation?
Acknowledge the tick only a few times as it appears, but then acknowledge what else appears, your mind reacts to it somehow -- fear, anxiety, memories, analyses etc. And go back to the anchor (step or breath). This way the tick will lead you to the stuff underneath; if you stay focused on the tick, you are practicing concentration and will miss that reaction. Mindfulness consists in both the ability to acknowledge what is there right now (not what was there two seconds ago) and also the ability to let it go quickly (back to the anchor).

It is normal that things don't disappear when you acknowledge them. Do you expect to start levitating when you acknowledge sitting?

It is likewise normal that childhood stuff appears in meditation (be it really from childhood, or only believed to be, that does not matter), and such symptoms might get worse temporarily; acknowledge worries about it (you seem to be worried about it being dangerous) and keep practicing, that's the way to clear it out, and the truth will show itself.

Usually (no guarantee; speaking of my experience) these things disappear as meditation wears off in daily life (e.g. feelings of craziness, extraordinary/painful sensitivity, physical symptoms etc).

Good luck!

(P.S.: since you are in Panditarama, won't the teachers give you an instruction when you ask them?)