Durood

Q: Is it permissible to write (SAW) after writing the name Nabi Muhammad?

Q: If alot of people are sending durood to Nabi (sallallahu alaihi wasallam) at once, how does Nabi (sallallahu alaihi wasallam) reply to all?

Q: There is a specific durood from the elders that I have found repeatedly. Yaa rabi salli wa sallim daa e man a ba dan a laa habeebika khairil khalqi kuli hi me 

Another adds the additional line of wa barik wa salim tas leeman ka theeran ka theeraa. 

It seems as is there is an emphasis of great virtue of this specific durood. Are there any virtues or specific benefits or importance of this durood?

Q: I've read in an authentic book that durood can be a means for our ibadah being accepted. Does this mean that durood purifies the good deeds a person has done like istigfar? For example a person does deeds with inadequate sincerity and then does durood.

Q: Can a woman in haidh write Durood Shareef in the books provided to write, as it has the name of Allah in Arabic and I would end up touching the word Allah which is written in Arabic. 

I have been doing it during my haidh, but I read somewhere that a woman in haidh cannot touch the name of Allah that's written in Arabic

Q: Can a person add Sayyiduna when reciting Durood Ebrahim in Salaah?

Q: I have seen some books that are printed for people to write durood. Can a person use these books for writing durood and will one be rewarded?

Q: I am facing some health condition like physical and mental, both are disturbing me for a few weeks. 

I saw dream where I'm very sad about my health and confused. Someone came to me and said Recite Darood pak for 125 lakh. Should I recite and how do I recite alone 125 lakh. I have to see to my kids.

Q: Why must we recite abundant durood on Nabi (sallallahu alaihi wasallam)?