ANSWER:

Making prostration outside Salah to do dua is not permissible as it’s an innovation.

I offer tahajjud salah daily Alhamdullaih I get peace when I prsotate & all difficulty &pain goes away but when am on my periods & dont pray & dont prostrate on the ground for my Rabb & make duwa I feel like really depressed is there any way out or can prostrate even when I am not praying during tahujjed ATLEAST & make duwa??though i keep my tongue moist with dhir??during periods too!!