Worsening of health after sending form off - should I report it?

I sent my PIP form and evidence off yesterday morning. Two of the things I'm claiming for are to do with having a stroke and having migraines. That evening I developed awful symptoms that made me think I was having another stroke. The right side of my face went numb and felt like cold water was being poured on it, I lost movement in my right arm and I became very dizzy. Absolutely terrified, I was rushed to hospital and was there all night, had a brain scan, blood tests and multiple consultations with doctors. In the end they said it wasn't another stroke but a hemiplagic migraine - a migraine that affects one side of the body and whose symptoms are like that of a stroke.

I'm of course relieved it wasn't another stroke, but this hemiplagic migraine is a severe worsening of my migraines. Previously they involved pain, vomiting and vision loss, now they involve these stroke-like symptoms such as losing the feeling and movement in one side of my body.

Even though I've just sent the PIP form off, should I send information about this latest development? Also does it count as being admitted to hospital for the night?