About two years ago I made the mistake of skating down a hill without a helmet and I fell and got a minor head injury/concussion. Ive gone back to the doctors to get MRIs and cat skans and they always come back saying I'm fine, however I get sick atleast twice a month. I've read that vomiting and nausea would be a side effect but I didn't think it would last this long, I guess my question is will this last forever? Or will it gradually go away over time? (Also I've tried multiple meds and none seem to work.)