File the complaint. It does sound like discrimination to me. Here's why: you disclosed your illness and asked for accommodations. They provided said accommodations, but then when these "issues" they claim arose, they didn't give you any kind of warning, they just fired you. That's suspicious. Filing a complaint with the EEOC only means that they will investigate and determine whether there was discrimination. If so, they will pursue it in court and you can too.

I have an open complaint with the EEOC myself right now, over what was clear discrimination. To me, your case looks like clear discrimination - just from your side. You had a great review in May, then your performance became an issue but you weren't warned? And so you were fired for cause? And seriously, for visiting Facebook? Many businesses use Facebook and ask their employees to share stuff and help promote. I know we were asked to help promote through our personal FB pages by sharing our employers posts. They had one instance of you visiting FB? They were looking for a reason. I would file.

But you need to do it fast. I believe the cut off is 180 days to file.

Seesaw