3 websites suddenly surging, overloading RAM, going down

All three of my websites are suddenly simultaneously surging, overloading my RAM and bringing all 3 sites down (and up) at the same time. I have Cloudfare’s free firewalls on all 3 sites, is there anything on the firewall end that could be allowing this or contributing to this?

Is that traffic to your sites is surging? I’d start with enabling under attack mode. From there you can look at the traffic to figure out how to create firewall rules to block the bad traffic.

And as a just in case, you may want to scan that origin server for malware.