[Psymoussy]

Asalaamulaikum

Loosen the imamah...if anything try to keep your head cooler if you suffer from cluster headaches, (I've been a sufferer for the last 8/9 years now and me and my consultant at the hospital have worked out many tricks to reduce them!).

Generally keeping your head warm will worsen any headache, as will stress, tension, exercise and most actions which raises blood pressure and/or heart rate. Throughout your fast try to keep as relaxed as possible inshAllah and have sabr. And absolutely ensure you consume adequate amounts of water when you can.

Aside from that...you take it as a test from Allah swt and motor through!