Yeah, the calling. I also wasn't comforted by it. Thank God I don't believe in afterlife otherwise I'd be freak out the person in question was in pain trying to reach out (that's how it sounded anyway). I talked to T about it, seems to be a pretty common way for ppl to deal with a loss.
Weird that it started happening again... I think you should talk about what it means to you, are there some feelings you haven't dealt with- guilt? Fear?
IMO trying to pretend stg is OK when your body is telling you otherwise is not helpful at all.