It's a perfectly normal to get a spot of colour that starts off small and gets bigger like a haze over your vision, but it is usually immediately before you get a headache instead of while you actually have a headache. If this happens it means your headache is a migraine and the colour is what they call a "migraine aura". I won't go into the medical explanation for what causes the migraine aura but it isn't anything for you to worry about - Google it if you want to read more about it.
Seeing colours during a headache or while dizzy
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It's a perfectly normal to get a spot of colour that starts off small and gets bigger like a haze over your vision, but it is usually immediately before you get a headache instead of while you actually have a headache. If this happens it means your headache is a migraine and the colour is what they call a "migraine aura". I won't go into the medical explanation for what causes the migraine aura but it isn't anything for you to worry about - Google it if you want to read more about it.