Easy answer, Hormones can make us feel so alone period, but to have a long distance must make it that much harder. Hang in there. After the first trimester hormones tend to level out so you'll feel like you can make decisions rationally. :-)
The harmonies will drive you crazy. But dont scare him away by being a drama queen..lol. He is probably trying to figure out how this will change his life too. Hang in there!!