Drifting apart?

I love my boyfriend more than anything but I feel like he's pulling away from me? we usually hangout A lot because our schedules are the same and shorter hours. So we are together like 16 hours a day. We had a rough couple of days because I've been under a lot of stress and my BC got switched so I've had a huge mess of extra hormones and emotions. He just seems annoyed with me. Yesterday he was so annoyed with me I actually left. Today, I told him I won't get off work till 4pm and won't see him till 6. He was like "6?! Why?" Like he wanted to see me earlier but still seemed annoyed we were talking. I told him I was sorry for the past couple days and he said it's no problem. We are going on vacation this weekend so maybe that'll spice things back up. We live together. I should talk to him about it but I feel like we've been talking for days about "feelings" and it's getting old. What do I do? I'm starting a new job where the training is an hour commute and I'll be doing that for a month. Then I'll be full time so we won't spend as much time together. I don't want to loose him.