Hi, I am Dr. Shreyash Mehta, MD Community Medicine I understood your query I hope my answer will solve your query. As you told that you had some concussion symptoms following an injury on the back of the head due to a car accident. The severity of concussion symptoms has increased starting from swelling and pressure in your head, numbness on left side of your face with tingling numbness on left hand. This is accompanied by difficulty in breathing. I think there is some injury to your brain I advise you to consult a neurosurgeon/ surgeon/ orthopedic surgeon immediately. There has been a swelling following an injury to you neural tissue. From the symptoms you described there seems to be certain injury to you cortex and nerves supplying you left upper limbs. The neurosurgeon might advise you a CT scan/MRI. He might prescribe you non steroidal anti-inflammatory drugs and neck brace. Please consult him immediately and follow his direction.