How well was your home ventilated after the coolant leak???
Are you absolutely sure the leakage was stopped, and you have not been having continued exposure to it??
You speak of having young children and of having 4 years free of CFS/fibro symptoms. Do you know there is a major school of opinion that states these are chronic cyclical and gradually worsening conditions??? When one is younger, they can seem to disappear entirely, but typically DO come back. Eventually, many just fluctuate in severity of symptoms without any time entirely free from them. The older one is and the longer one has had them, the more likely this chronic/cyclical outcome is. I wish that this info had been available when I was much younger. Would have been much more careful with many lifestyle choices if I had not mistakenly though that I was entirely "cured" several times and gone back to old habit that were causative.
The epileptic-like stuff can be caused by chemical and biological agents. For me, has been pesticides and molds. In my case, standard tests for epilepsy have not shown the typical results for a positive diagnosis, but I have had the symptoms off and on in response to the toxins just mentioned for many years.
If many of the neurological symptoms are arising at work, your work environment may be toxic for you due to chemicals, molds or other biological entities in the HVAC system, etc. While it is entirely possible that you would be the only one so affected, it is more likely that others are also having problems if your workspace has sick building syndrome.
Anyway, that is a lot to try to take in, so will sign off now. May your search for wise health choices be blessed with success.