Feel sick at the same time every day?

Julia

So right around 3:40pm I start to feel sick. Nausea, headache, light headed, weak... ive tried eating different things, amounts at different times. Drinking more water etc etc.

Everyday same time i start to feel this sickly feeling.

I feel bad for my husband because im okay all day and then promptly 1-2hours before he gets home from work i get sick and am useless the rest of the day.

Ideas on why? Or how to make this not happen?