Assalamulaikum brothers and sisters. I have a matter that is most troubling and puzzling at the same time. I would like to be as detailed as possible and I greatly appreciate your patience. I have been bombarded with evil thoughts and uncertainties now. This is to do with any aspect of Islam. Allah (SWT) has blessed me with a lot of knowledge, proofs of His greatness and oneness. Yet these still occur. These happen particularly in Ibidah and during the pondering of the noble Qur'an. However, even though I have these proofs, I have still committed grave sins. When I go to repent, i get a tight feeling in my chest and I feel like I am not sincere and it feels like I'm not regretful. I try my best to be. Similarly, while committing these acts, knowing the great power of Allah, I tell myself "Allah the greatest is watching. Don't do it". I still end up doing it with a tight feeling in my chest, and sometimes it goes as far as getting a feeling that I don't believe that. I absolutely hate this and abhor it. Help would be greatly appreciated. I want to be sincere as possible to Allah (SWT) and his religion.