I had something similar happen to me to: First, a feeling of doom and a strong headache on the left side of my head. Then a tickling sensation in my right hand, then numbness. Then, within minutes, I lost my words.
I could still think normally - for example I reasoned that it made sense that my right body side was affected since the left side of the brain, where the language area was located, controlled it. So everything else felt and functioned normal. When I found words and wanted to speak them, they were often switched up.
The human brain is fascinating. Have a look at this:
A review of 80 years of memories inducted by electrical brain stimulation http://gpe.ups-tlse.fr/memstim.php
>The patient reported hearing the theme music from film Star Wars, while at the same time "seeing birds" and feeling like "going through a tunnel."