Assalam alaykum, I believe that you have a clinical case of OCD. In the short run, you need to see a psychiatrist and get on some meds because of the intensity of your symptoms. Please do that. You know that Allah SWT is in control of the universe. Whether the bus crashes is His Divine Decree. He knows we are imperfect and I believe He makes allowances for that. You should do your wudu and salat one time only without repeating them. If you understand a passage in what you are reading, studying, or reciting, move on to the next. Put the results of the matter in the hands of Allah. Remember that Allah is the Forgiver and He wants our Deen to be easy. Wassalam