I know what you mean about being self-employed.
I've been contracting for about 9 years now, and while it gives me loads of freedom to do whatever I want, usually what i want is more wok so I can pay the rent hehe.
At least I don't have to ask my boss for time off when want to go on holiday - or book that holiday months in advance in case someone else gets that slot.
The one thing did on my last holiday a few weeks ago, was go somewhere with pretty much no cellphone coverage. So was uncontactable for a while.
So couldn't worry about work, because there was no way to do any work.
My next big holiday (hopefully next year) will be the same - no ability to work, so I wont' work.
You might like to try that also - a holiday is a holiday!!