Yes, I've had one about 5 years ago. I had a headache that stayed with me for about 2 weeks so my GP ordered a head CT scan. Honestly, it's nothing and takes about 5 min. Mine turned out to be nothing and soon after the scan, my headache disappeared. Typical.....

Please don't worry. Your doctor is doing a good thing by ordering the scan. It's better to know than not. Like mine, it will probably return positive results.

Fingers crossed for you.