I've come to understand that for the past several years (at least), I have been having delusions. These delusions are often about people and it leads to splitting, however I also have delusions that I'm being stalked/watched (often leading to social media purging, and it's obsessive purging that takes HOURS (deleting EVERYTHING in the Facebook activity log for example)), and as someone who prides himself on being 'rational' I am having trouble processing this revelation. 

My question is this: how do I know when I'm being delusional? Is there a checklist of things I can do to figure out if I'm experiencing a delusion? I'm now terrified that I'm holding other delusions that I'm unaware of. Is there some kind of BPD way of having a reality check? 

Thanks in advance. 