Okay I think I got a concussion in my recent crash, and the symptoms are getting worse

Luckily the CT scan they did at the hospital showed nothing but I’ve read that it usually can’t detect plain old concussions. My brain is foggy, simple things are super hard, and I’m still having memory problems (short and long term). And it’s been getting increasingly worse. Have to wait till Monday to try and get in with a specialist ugh.