@LDP - You are still in a state of shock as well .... and feeling down is definitely totally normal xx
A bit of your background story leading up to the Mets diagnosis would help us understand a bit more too.
It looks like you have already joined the Mets group - so I hope they are helping you too.
If you add your 'general location' to your profile, we may have members nearby who might be able to head you in the right direction re available counsellors/Psychs ....
As well as Abbydog's suggestion - The Oncology dept where you are having your treatment should also have a dedicated Social Worker who should also be able to arrange an urgent meeting with a psychologist ... so absolutely don't be afraid to reach out to the health professionals. xx
Here's a link that may help with some of the forum's 'other features' .... even a couple of funny areas, for a bit of a laugh ....
https://onlinenetwork.bcna.org.au/discussion/23477/a-big-welcome-to-all-our-new-members#latesttake care & all the best