I"m sorry to hear that you are going through this Odd. I have experienced this with my husband and sadly I have yet to find the appropriate way to handle it. My H gets "stuck" on subjects and it seems like he is almost manic. I will listen to him talk about a subject, but then it just starts to get more and more bizarre. He begins to get upset if I tell him I don't want to listen anymore or if it seems like I'm not listening.
As for 911, you might be able to get him into a 96 hour hold if you thought he was a threat to himself or others. The police would transport him to the hospital.
What in particular made you feel unsafe? It is extremely important if you find yourself in an unsafe situation that you have a plan ahead of time for how to handle it. We have the "Safety First" link at the bottom right of this page and here is the link to the safety page.
https://bpdfamily.com/discussions/search-info2.htm