Pronunciation Doubts in Salah and Fear of Shirk

Assalamualaikum What the ruling on this , If during prayer a person gets confuse and is also dealing with extreme waswas about commiting shrik . And also recites loudly in prayer So while , reciting , Ar-Rahmaanir-Raheem. He/she thinks , it's should be r should be doubled and ha is to be pronounced from the bottom of the throat (while not being certain about if it really it to be pronounced like this) , but when one recites , r is not doubled and if ra and ha is doubled , but when coming to end , r is not doubled but ha is pronounced and does it again but same result . the person thinks he/she is not paying attention , so again recites it . But r is not doubled , or something happens and one does not remember it after the prayer .and when recites it softy as there is someone around him /her . Ha is not pronounced correctly . And the person thinks , you cannot pronounce it so just go on , but in the salah , other times ha is produced correctly while some times it is not . So if one pronounced , ha roughly, very roughly, would it change the meaning . And what to do if one cannot remember after teg prayer what really happened and now is worrying about , what if during the prayer , he/she was negligent and now has left the fold of islam . And is it allowed to not learn makhraj as it might make the waswas more bigger in salah. Thank you .