Intense headaches after rides

[Ana]

Despite my best efforts to stay hydrated, I very commonly get migraine-like headaches after rides. They cause sharp pains in near my temples accompanied by sensitivity to bright light. I usually eat and drink water before I head out on my rides. I never ride more than 25 miles and I sip my water bottle every 10 minutes or so.

After my ride, I drink more water and eat something. Today, I ate cheese and crackers.

Still, my headache persisted for about 3 hours. I dislike taking pain killers and therefore try every alternative (hiding in dimmer light, drinking lots of water, etc). The headaches tend to subside eventually (4-6 hours) without medication but I suspect it may be externally induced.

I suspect it may have something to do with my bike fit but am mostly uncertain.

Does anyone else get headaches (or has in the past)? How did you remedy them? Any suggestions?

Thanks in advance