Is it legislated for a Muslim to exhaust himself with thinking and obsessive thoughts regarding precise matters such as hypocrisy and mockery, fearing that actions falling under these prohibitions might emanate from him or others, thereby causing him psychological fatigue?

A student's reflection on and understanding of what they study is required, but what is mentioned in the question is not contemplation of knowledge; rather, it is a whisper from Satan (waswas). One is not to be judged as an infidel, hypocrite, or sinner merely based on a statement; for excommunication (takfir) is a serious matter not to be approached based on mere conjecture.