I can identify with this. I'm sitting here at work with my knee throbbing, but as soon as my doctor is back from vacation on Monday I'm going to call. It doesn't feel any better sitting home, anyway.
For now, go ahead with your vacation plans and take advantage of using a wheelchair in the parks. You should probably make the doctor's appointment now for as soon as you get back rather than wait until then and then have to wait for an opening.