Ruling on praying by gestures because of a headache
Question

                Sometimes I get a headache and I cannot pray except by means of gestures. I do not prostrate because of this headache with which I cannot prostrate. What is the ruling on this? May Allah reward you with the best of rewards on my behalf.
Praise be to Allah.
      Allah, may He be glorified and exalted, says 
      (interpretation of the meaning):

    “So keep your duty to Allaah and fear Him as much as you 
    can”

    [al-Taghaabun 64:16]

    “Allaah burdens not a person beyond his scope”

    [al-Baqarah 2:286]

    So if a person has a pain in his head which makes it 
    difficult for him to prostrate on the ground and he will be harmed by that, 
    there is nothing wrong with him making gestures, and his gesture for 
    prostration should be deeper than his gesture for bowing. There is nothing 
    wrong with him bowing and prostrating in gestures, but his prostration 
    should be deeper than his bowing, if it is too difficult for him to 
    prostrate on the ground because of pain in his head or other sicknesses 
    which prevent him from prostrating. 

    Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him)