Problems with Strat

I have a little problem with my Squier Strat.
When doing bands near nut (up to 5th fret), the nut goes up (direction from high E to low E string) for about 2 milimeters.
It really goes on my nerves.
Should I put some glue and what kind?
If I do, isn't that gonna be the problem when I sometimes want to replace the nut.

Go ahead and put a bit of glue on it. I doubt you will find any need to replace the nut; putting a floyd rose style locking nut on a squier probably isn't worth the price, and there are few other reasons to replace it. However, if you do want to replace it, a little bit of glue won't stand up against some heavy duty pliers! Seeing as you're replacing it, it's not as if oyu need to keep the nut intact or anything. The moving nut will affect your intonation though, and I advise that you fix it.

Yeah, but after a while, the nut should be replaced after a while because strings (especially using tremolo) ruins it. I will fix it when I change strings.
What do you think is better, glue for wood or super glue, or something else

What you need is a graphite nut. They last long without wearing down, and there is less friction ( when you bend and release a string it returns to the pitch closer to the original than with regular nuts ). I pull through with a regular nut ( glued ) and a pen ( graphite ).

thank you for advices.
I heard about graphite nut, but I don't think I can find one in Yugoslavia :)
I think I'll glue this one before I find graphite one.

Use a small amount of a (Super Glue) cyano-acrilate type glue. This glue hardens in a few seconds, so you won't need to clamp the nut in place and wait for hours. Another advantage is that it strong enough for this particular job, but is relatively easy to overcome if you decide to replace the nut at some future time.

Thank you very much :)
this helps alot