Always document every single incident, your feelings about that incident; were you frightened, stressed, couldn’t sleep, felt like your stalker was going to get to you (no matter how hyper vigilant you were being)?
It is so very important to have a timeline with the date, time, what you did about it, what happened and how you felt about what you had just experienced. Documenting every incident, keeping that log in a secure place, will help law enforcement build a case against your stalker.
Stay safe!