Witr and Nawaafil

Q: I have a question regarding Ishraaq salaah. I noticed a Hadeeth mention something to the effect that whoever offers the Fajr salaah in congregation and then remains seated, remembering Allah until sunrise, and thereafter he performs two rak’ahs, he will receive the reward of one complete Hajj and one complete Umrah.

My question is directed at the part that says 'remains seated remembering Allah until sunrise'. In our masjid, there is a tafsir program that takes place at the back of the masjid after the salaah is over, so I do not remain seated in the same place. I also drop my father off at home thereafter. Will the reward still be the same if I come back to the masjid afterwards and wait until the sunrise comes to read the Ishraaq Salaah?

Q: We know that praying 8 rakaah in tahajud is sunnah but there is no limit on the number of rakaah.

My question is should we pray these 8 rakaah in pairs of 2 or 4 and if we want to pray in pairs of 4 for example 4+4 is 8 so should we recite another surah after fatiha in the third and fourth rakkah because we know that reciting a surah after fatiha in the third and fourth rakaah is wajib in sunnah e muakadah and ghair e muakadah.

Q: Please can you kindly advise on the following from a Hanafi point of view:

1. Reading Sabina Taraweeh in the Kingdom. Is it permissible to do so?

2. Are we allowed to read Witr in Jamaat in the Kingdom as their method is different?

Q: After praying Fajr, can we offer nafl or do we have to wait after sunrise?

Q: There are 2 virtues to ishraaq. One is the reward for hajj and umrah, the second is that one's day will be made easy. To get both these rewards, should 4 raka'aats be read in one go, or each set of 2 raka'aats separately?

Q: If I join an Eshaa Salaah behind an imaam with the intention of nafl, after missing the first 2 rakaats. Will I have to make the missed rakaats after the imaam terminates the salaah? Or will the 2 rakaats of nafl be valid and I may end the salaah with the imaam?

Q: What is the maximum amount of rakaats one can perform in tahajjud with making salaam in the end? I heard that the most is eight rakaats, but can a person perform more than eight rakaats with making salaam at the end?

Q: Please explain the manner of Rasulullah (sallallahu alaihi wasallam)'s tahajjud and the duas he would recite upon awakening for tahajjud.

Q: When I perform my Tahajjud prayer, I have a pain in my head and my brain stops working properly.

During Tahajjud prayer I feel that something is shaking in my head. Please give a solution for this.

Q: Can Dua-e-istikhaarah be performed for trivial decisions, or should it be reserved for major life choices?