Salaah

Q: I would like to know if it is permissible to read Salaah with make-up on?

Q: I have been missing and delaying prayers due to the time it takes me to make istinja and Wudu because I am suffering from OCD/Waswasas. I feel like a kafr because I have heard that your're a kafr if you miss prayers without an acceptable reason. I am definitely not missing/delaying prayers on purpose so am I considered a kafr? What should I do about this situation?

Q: Can you break your salah if someone is knocking on your front door or ringing your phone?

Q: What should be done if while praying one is not sure if they broke their wudhu due to wind? I often try to hold the wind but I am not sure if
I was able to hold it or if I let it out slowly?

Q: How long does the Aa in Aameen have to be stretched for?

Q: In Ruku are the elbows meant to be tucked in or sticking out?

Q: When sitting in qaeda position where does one look? At the hands, knees or lap?

Q: When having risen from Ruku, does one recite Rabbana Lakal Hamd or Rabbana Walakal Hama (i.e. with the و or without the و)?

Q: Should you say alhumdulillah if you sneeze during prayer or wait till you have finished the salaah?

Q: Can I read 2 rakaats Tuhajjud and the rest my Qaza umree? I find that I am least disturbed at that time (tuhajjud).