Concussions don't show up on CT scans.

Who told you you were no longer concussed?

I imagine that your PCP knows what you're going through? 10 concussions is a lot, and concussions have a cumulative effect on the brain, regardless of whether they show up on a CT scan or MRI.

Have you seen a neurologist? Try to get a referral to see one who specializes in head injuries and/ or concussions.

I can't tell you whether you can return to your job after what you've been through.

If these were caused by auto accidents, get an attorney. You might just want to get an attorney anyway. Don't sign anything or take any kind of settlement until you speak to an attorney about these incidents.

Try to stay calm and not worry. Experts believe that anxiety can adversely affect recovery from head injuries and concussions. Also, experts also recommend not to dwell on your symptoms.

Make sure you are eating healthy foods. Sugar and too many carbs are not good for the brain. Make sure you take your vitamins and minerals, especially the B vitamins, they are really good for the brain. My neurologist is especially keen on B12. As are Omega Acids, 3+6+9, I take mine as an oil every day. I have read about research that says BCAA's might help people recover faster from brain injuries - the article is posted somewhere in this forum... I take them as a supplement, but you can find them in red meat. Protein is also very good for the brain.

Try not to "overdo" it. This means don't stimulate your brain too much... the patterns and light and sound may be too much for your brain to process it all - they take extra processing power.

With some time and rest, hopefully, you'll get back to closer to normal.

I was in a bad auto accident about 20 months ago - before that time I worked back stage about 60 hours a week and I was super strong. I wasn't able to work or drive for a year after the accident. Now I can only work 20 hours a week and I have to take it easy. My Dr. is allowing me back to a normal schedule very slowly. We all have our stories here, but my point is that it takes time - I'm still noticing huge leaps in my recovery and we all think I might make it very close to normal, but it might take a long time for me to reach that, so try to be patient.