Strange Internet Outage

I am experiencing an extended selective outage. I can only access the internet to view Google based things (google, youtube, gmail work fine) most other sites all time out and fail to connect. This is across multiple devices (phone, tablet, pc, laptop). TV cable still working too.

Xfinitiy did tell me earlier that some work was being done today for somekind of upgrade that may cause outages, but I also recieved a text saying it was done and connection was restored. 

I've have mixed information for xfinity sources about if or if not there is an outage in my area. On top of that, I've never heard of a selective outage like this, where some sites work and others are being seemingly blocked. I don't know what to do.

S.O.S. Please Help.