Thanks for reading my post and for help translating.

sinirlerim ne kadar. yoklasa da ihanetin sınırlarını, ZULAMDA halâ tebessüm tozu var. GÜL desen, gülecektim oysa..

This is interesting. I see some ambiguity, maybe even a word game. This is sort of a try though:

I have such (strong) nerves.

Even if your betrayal tested their limits

I still have some powder of smile in my secret storage.

But if you said laugh I would laugh.

On the other hand, if GÜL was used here as a term of endearment it would make more sense...meaning if you spoke to me sweet words after what you have done I would not take them seriously. But this is just guessing from my side.

Abla, Thank you very much!

Sinirlerim ne kadar yoklasa da ihanetin sınırlarını, ZULAMDA halâ tebessüm tozu var. GÜL desen, gülecektim oysa..

more undertandable

It seems that I rewrote the lines. :O

Without the full stop:

No matter how much my nerves test the limits of betrayal

there is still a smile in my secret cache.

If you said laugh I would laugh.