What Causes Right-sided Numbness In Body?
A stroke is possible.
Detailed Answer:
I read your question carefully and I understand your concern.
An aneurysm shouldn't be the cause of those symtoms, as when it ruptures it causes very intense sudden headache and symptoms do not regress.
However an ischemic stroke (brain lesion due to insufficient blood supply) is well possible considering those signs. Even if they regress completely including the vision still a transient ischemic attack is well possible which could herald a strke establishing next.
For that reason you need emergent medical evaluation for evaluation of general physical and neurological signs, imaging, ecg and blood tests both to evidence a possible stroke as well as to find possible causes and take measures to address them (causes like heart arrhythmia or other risk factors like diabetes, hypertension, high cholesterol etc). So I suggest you see a doctor as soon as possible, perhaps heading for the ER.
I remain at your disposal for further questions.
In the brain.
Detailed Answer:
Yes, if a stroke is proven, it is a blockage or narrowing of a blood vessel in the brain leading to lack of blood flow in the brain area it supplies.
I mentioned the heart because a very common cause of those blockages are heart arrhythmias which form blood clots in the heart chambers which then may detach and travel through blood circulation to cause occlusion of a blood vessel elsewhere like in the brain.
So it is in the brain, but the origin of the clot may be elsewhere, so prevention so that it doesn't happen again is vital.
I hope to have been of help.