To answer your question, if you have experienced a headache like you never had before,a stiff neck,nausea and vomiting, seizures, loss of conciounesss,sensitivity to light,then you would have attribute these to the
possibility of an anuerysm.
Additionally,if you have experienced pain behind or above the involved eye,numbness or weakness on one side of your face, a droopy eyelid, or double vision ,these can also be the sign of an anuerysme
If you have had any of these symptoms you would want to be seen as soon as possible in a medical walkin.
However based on what you have said it is an issue of noticing your pupil reaction then you should follow up with your primary care doctor and a Neuro-ophthalmologist to evaluate the exact cause.
Does this make sense, any other questions?