Is this normal? If not, what is wrong with me?? Thx.
Not at all unusual. I think it's evidence of how much you love him. Perhaps a hard way to discover it, but now you know for sure, if you didn't before.
Whenever my husband is away for some reason I have trouble sleeping without him at my side. With my late husband I couldn't even bear to be alone in the big bed we shared, I would go sleep on a small futon in the office while he was gone.
My late husband and current, and the BF I had in-between them, all did the same curious thing whenever it was me who was away for a few days. They would lay out some of my clothes from the closet on my side of the bed, so they could touch them at night. Each time I learned of this I was shocked, and brought to tears. That anyone would miss ME that much was inconceivable to me.
Maybe doing the same thing yourself with his clothes would help you? And for you to keep in mind, as hairyandym said, it's only for a very brief time. He'll be back before you know it.
I do appreciate that Christmas Day will be empty, nothing much to offset that. Did he leave you some presents? If so, and unless he gave you instructions otherwise, I would resist the temptation to open them. Save them until he returns on the 30th, so you can open them with him, along with his own, as if it were the 25th. He'll like that.