Is this something neurological or vascular? I was biten by a stray cat on Thursday of last week. I had it picked up by Animal Control on Saturday and quarantined. 

Today, I suddenly experienced pain in the back of my head, pain in my right eye, pain in my right leg and the acute, sudden appearance of a black blob/box in the middle of my visual field.

I also felt weak all over, my chest felt heavy and I felt a vague "blah" feeling all throughout my hands, arms and shoulders (I was bitten on the left hand and all these symptoms seemed to have arisen in the right side of my body).

The doctor at the ER was sufficiently concerned to order a CAT scan. It turned out normal.

However, he cautioned me to keep on eye on things and to check back with Animal Control to see how the cat is doing (thus far, after nearly 4 days in quarantine, animal control has not contacted me in any way).

I am taking antibiotics as prescribed (Amoxicillin) and received a Tetanus injection the same day as my cat bite.

The cat normally doesn't bite.

Summarized question: Are pain in the back of the head, pain the right eye, pain in the right leg, sudden appearance of a black blob in the middle of the visual field, and weakness after cat bite symptoms of something neurological or vascular?