All the best, and assume that its not something very serious.. I've seen my mother as a physician deal with her mother getting sick(at a ripe old age, thankfully), its different when you yourself fully understand whats going on..
if it needs to be done you'll get her through the mri. Kids are resilient..
Regarding growing pains, I can vouch for LawrenceMD's story that they can be a bitch. Nothing horrific, but more of a nagging pain. Had them until 17 or so.
As for my own annoyance of the day, i've got a phonecall scheduled for the end of the day with somebody who doesn't understand what he is talking about, but does act like so. To explain, I've started a turnaround company a few months back with two friends, that have a lot of experience in the field. We've been talking to several potential clients, and things are looking good. The phone call I'm having is with a guy who works at the "special credits" department of a large bank. He has a client who would benefit from our services, as would the bank. He now wants us to agree on a fee structure for him personally, without him handing over any basic data beforehand, such as turnover/balance sheet/ debt ratio/personnel. I can understand the need for assurances for him, but without any basic understanding of what he has to offer(and even then the owner of the company still has to be willing to work with us) I just find it ridiculous to talk fees without even a basic picture.
In a normal situation I would have told him to f-off in a polite way. But being a startup we can use all the assignments we can get, so I now have to educate this clown until he realizes that what he is asking is just dumb, and paints a very incompetent picture of him..