The Reality Of NAZAR (Evil Eye)
These Duas shouldn’t be seen from the perspective of countering Nazar (Evil Eye) only, but rather from the perspective of the person initiating it. It is an expression of association of a Muslim with the Almighty and of our belief that beyond the realm of ’cause and effect’, everything happens with ALLAH’s Izn. I think as a Muslim we should always seek Allah’s protection from every kind of evil, whether it relates to physical world or Nafsi world. I believe this is what Prophet Muhammad (sws) taught us with these duas as well. It doesn’t necessarily proves or disproves the existence of any such thing; what it does is, it necessarily kills any room for superstitions and associating any kind of polytheistic beliefs with those superstitions.
You’re discussing the physiology of headache, but there are kinds of migraine we do not know with certainty as to why they happen i.e. we know how they impact us from a biological stand-point but we do not know the exact triggers which cause them.