OP, I used to be the same as you, in fact, I could have written your post a while back.
I learnt the hard way, that this isn't the way to behave. That I was relying on DH for my own happiness. Once I started focusing on different things and shifted the way I thought and behaved, things started to get better, for myself and in our relationship.
You sent him an email, because you felt like you needed him to know how you felt. If it was anything like the emails I used to send though, it wont have been a quick email, it would have been a deep over analysis of everything and it's too much. He's probably thinking 'here we go again'.
Over analysis, self obsession and dwelling on things is no good for anyone. You need to stop! Take up a hobby or do something to keep your mind occupied, go for counselling or keep a diary if it helps. No-ones life is perfect. Everyone has ups and downs, little slips here and there. It doesn't mean it's all going to fall apart.
You mentioned bereavement, stressful situations like house moves etc, maybe these have affected you more than you realise? You can't rely on your happiness to come from your DH, it's not up to him to 'make you happy'. You need to do that for yourself.
I think the best thing you can do now is breathe, don't panic. You have said your bit, leave it now. Get ready for your holiday. You can't change what you said, nor can you change his reaction to it. What you can change is how you behave in the future.
He'll talk when he's ready.
Good Luck! xx