Those things which render the Salaah invalid

Q: While reading salah saying Allahu akba will that break my salaah? Suppose I'm going to ruku if I say Allahu akba and to correct it can I again say allahu Akbar when I'm in ruku or doing this will break my salaah?

Q: If we control gas during namaaz, will it be valid or not or again we need to perform the prayer and wudhu? If we are not sure that wind is passed or not at that time, then what should we do?

Q: While reading namaaz different types of sounds come out like when I close my lips and while opening the lips and due to the movement of the tongue some sound is generated and while reading rabbana lakal hamd near hamd different sounds comes out, when the tongue touches the upper lip. Do this kind of sounds invalidate my salaah? Can you tell me which kinds of sounds invalidate salaah and which of them don't?

Q:

1) In salaah, if you move your head in any direction (right, left, up, down, back or forth), does this nullify the salaah?

2) Moving your chest in salaat in a direction away from the qiblah, does this nullify salaah?

3) If your pants has a small hole and your skin is visible through the hole, performing salaah in this state, will your salaah be valid?

4) If the underneath of a shoe touches the top of your feet, do you have to wash that part of your feet before performing salaah?

Q: If your swear in your mind in salaah, does it break the salaah?

Q: If you intentionally accumulate saliva and swallow in salaah, is your salaah broken?

Q: If a food particle is stuck in my throat, and I swallow it while in salaah. Is my salaah and wudhu broken? If a food particle is stuck in my throat, and I do NOT swallow it while in salaah. Is my salaah and wudhu broken?

Q: I was wondering if my Salaah is invalidated if I make sounds during the Salaah when going down into sajda as a result of feeling a pain in my foot?

Q: As far as I am aware, speaking intentionally or unintentionally will nullify the salaah and it will have to be re-prayed again according to the hanafi maddhab (although, if I am incorrect in my understanding then please correct me jazak Allah khayr). The question I would like to ask is that say for example, if I recite اَللَّهُمَّ رَ‌بَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الْآخِرَ‌ةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ‌ and in my heart I say Aameen but my tongue may move slightly unintentionally, however there is no sound of any letters coming out, can that be classed as speaking in Salaah?

Q: If I carry out my fard salaah and later after the time where the salaah is valid, find out that I did an action that would have invalidated the salaah, is it sufficient for me to not repeat that mistake in all future prayers or must I make up the salaahs that I unknowingly carried out the mistake in?