Doubts in Salaah

Q: I have OCD therefore in salaah I try to keep silent but as I try to do so it counter attacks me (the opposite occurs), thus by force I make a small sound or a small sound which can be the result speech, thus I should repeat my salaah until I feel I havent made a sound or speech, but lately I said enough is enoug this can be something like wasaawis which I also have a problem with thus weather I make a small sound or speech I regard my salaah as valid, please what should I do?

Q: What should be done if one forgets the number of rakaats completed while reading Salah?

Q:

1. If I felt like a drop of urine came out during salaah but I was not certain, after salaah I saw that a drop came out I do not know if it was during salaah. Is my salaah valid?
2. I was also not certain if it came onto my clothes and regarded it as pure. Is this correct?

Q: If one has a doubt if he missed a waajib or fardh act what should he do?

Q: If one has a habit of forgetting multiple things in a Salaah such as number of rakat, number of sajda, first tashahud and so forth, how that person would perform his salah?

Q: When I do a long sajdah I sometimes forget if it is the first sajdah or the second sajdah. What should I do in this situation?