<human>: Could you distill the essence of the text into 1-3 sentences?

I've been having trouble sleeping lately, and I've never been a good sleeper, but it's going a bit overboard lately (I can't sleep till roundabouts 6 AM). My girlfriend has been on holiday with her parents for the last week and a bit, and is coming back tomorrow. I haven't been sleeping well since she's been gone (though we don't even live together or regularly sleep over or something, we live quite far apart), but I think it's mostly unrelated, or at best one of the many reasons. When she comes back though, the first thing she'll ask if I was alright. I wasn't, in short, for various other reasons as well, but the problem is, if I tell her this, she'll feel incredibly guilty because she'll make the automatic connection (although faulty) that it's because she wasn't here. I know her well enough to know that she'll think this. 

Now, the question is, should I refrain from mentioning this, or should I be honest and try to explain as best I can with the strong risk of making her feel incredibly guilty?

Other info that might be required:
I live on my own, I'm 19, she's 17. We've been together for give or take half a year, more probably.

This might sound like a really obvious question to some, but I'm having some trouble figuring out what the right path is here, and I hope you guys understand.
<bot>: Trouble sleeping, girlfriend with ask about how I was while she was gone, I wasn't doing alright for various reasons, she'll most probably blame herself, should I tell her?