Hi,
Welcome to the forum! I've had epilepsy for 35 yrs. and 2 brain surgeries to help reduce my seizures. I ask myself if the chemicals you were working with created a toxic odour which in turn caused the dizziness. I've had this happen to me while working in Science Labs. As far as the milk goes your body could be changing and now you are allergic to milk. Take note if you feel more dizzy when you drink a lot of fluids, eat more sweets than usual, if that's the problem your body is taking in to much fluid which in turn causes more electrical activity in the brain.
If I may ask have you ever blanked out or felt confused or tired after this has happened and do you notice a rapid heartbeat? These are all signs of a seizure or anxiety attacks. Here's wishing you well and May God Bless You!

Sue