Since March, I've been getting incredibly painful headaches in the back of my head on the left side that sometimes go right through to my left eye (eye doesn't hurt but I can feel pain behind it if that makes sense). Nothing seems to bring this on but the cold makes it worse and paracetamol etc does nothing. It's always on the left side and is a strong pain for hours and then eventually dulls into a constant throbbing ache. It makes me feel ill. For example, I started having one about 12pm today and it's only now going into an ache and it still hurts behind my eye. Has anyone had this??