I have taken many MRIs (with and without contrast) after my mild Traumatic Brain
Injury and diagnosed with
Post Concussion Syndrome. Faced no problems with contrast
. Very rarely I heard people cannot tolerate the contrast. Some labs do a Creatine (?) test before giving contrast. You can ask your lab about that.
I have been suffering with Post Concussion Syndrome for 2+ years now. Headaches, nausea, dizziness, fatigue etc., and my symptoms got worse only after 5 weeks.