Well, unless certain other things happen, I think you're safe. If Jackson, Matt, Deucalion, or the Argents show up, then there might be reason to be afraid, but other than that, you know who to be wary of.
Meredith used phones. I'm not sure if it made her feel less crazy or actually helped her focus, but she would "listen" on phones and talk to the voices in that way. If that helps.