You can't. You need a third party (such as a psychologist) to definitively tell you what's what. It's super easy to fool and mislead ones self.
I once thought my girlfriend hacked into my computer and corrupted it somehow; I lost everything. In hindsight, that was a crazy thing to think, but at the time it made sense given who she was and what was technically capable and all that.
What one must do, is separate what is possible (being hacked) from what is likely (computer crash) from what is absurd (girlfriend did it). This is not always easy, and not always straightforward, and not always something you can and should do by yourself.
Also... stress is a biggie. aderall likely won't help things either. People have lapses, behave irrationally or quite insanely as result of temporary outside factors. So, Its not something to worry about in that sense, but its certainly something to identify the cause of and take action against and monitor.
best of luck!