You know how to get to the console from the DCUI?
If not this might help : Using ESXi Shell in ESXi 5.x and 6.x (2004746)
Once in there:
vim-cmd vmsvc/getallvms to list all VMs registered to the host.
You need the VMID from this list of any VMs you want to start.
vim-cmd vmsvc/power.on {VMID}
To power on a VM.
With any luck you'll find the host with one of your DCs and that will allow you get everything back up more easily.
