I would also have to say PCP is the best place to look for something. My PCP denied at first that I had post concussion syndrome and checked for everything else (This is how she got my other diagnosis of hypokalemia (low potassium)). I lost so many minerals from being nauseous, but potassium was the one I lost the most of and it impacted me severely. The low potassium levels were making me more lethargic, I ended up going to the ER at one point getting an IV due to this. 3 ER trips I ended up with due to my brain injury. The medical bills added up and even though I wasn't getting any better, they took care of me in ways they could. The last ER trip after urgent care told me I had anxiety from post concussion syndrome, I never knew what or how anxiety felt but that day I knew after talking with a friend about it. I was rushing to hospitals and it was such a scary experience, I thought I was going to die all the time due to the panic attacks. 2 months later, even though I still have anxiety, its not as bad as it was. I now go to therapy and my PCP takes care of me making sure all blood work is done every month to check to see if electrolyte levels are good and everything looks good. She also checks my vital signs and does the neurological testings. She says I am improving every month, my pupils are back to normal, which surprised her. Today after 3 months, I still get occasional nausea, anxiety, sometimes a panic attack, insomnia, loss of appetite, and mornings well are horrible as usual. But anyway , good luck, the PCP will find if there is another problem, they are good at that.