Hanklee,
A grade one concussion is enough to make you see stars and rattle your cage a bit, but should not have long term effects.
I do however need to ask a few questions;
1. Did you know where you were after it happened and for 3 to 4 days afterward?
2. Did you know what day it was the day it happened and for 3 to 4 days afterwards?
3. Did you know who you were when it happened and continue to do so?
The reason I asked these questions (and I’m sure you heard them before) is for what the medical community calls orientation. Answer one and its orientation x 1, answer all three and its orientation x3. The more orientated you are the less severe the injury, especially one to the head. The brain does not like being shaken around, and there is a term for that called coup and counter coup. What happens is that when hit, or in your case stepped on, the brain violently shifts to one side of the head, then it bounces back. Causing a concussion, the most severe is a grade 3. That is where you black out and stay that way for over 24 hours. In your case, the doctors have said grade 1, meaning a mild shake up to the brain. A grade 2 is where you black out for more than 5 minutes but less than 24 hours.
Headaches, blurred vision, nausea, vomiting are not good several days afterwards or in your case weeks. I read where you are scheduled for a CAT scan, good. If the symptoms get worse before the CAT get in touch with your doctor immediately, not to scare you or panic you, but you might have, notice I said MIGHT have some bleeding going on in there or some swelling causing the symptoms to remain and not subside. Good luck to you, keep us informed as we tend to worry ;) .