That's a major bummer
I'm terribly sorry you are going through that right now!
I think the best thing for you to do is **remain calm**. Freaking out would probably scare him if you get in touch with him!
What kind of voicemails have you left him?
Try just leaving a casual one like "Hey there.. I haven't heard from you in awhile, so I was just making sure our plans for this weekend were still on" (or something to that effect)