Sorry to read what you have been through in the past but there is light at the end of the tunnel.
Noticed you have joined the Life After Cancer Group - It may be worthwhile posting a similar message into that group as everyone here is more than willing to help eachother get through this; be it just diagnosed of trying to find their new normal. Also possibly the Brain Tumour Group as individual groups do sometimes arrange meet-ups.
You could also try the "In Your Area" tab at the top of the page, type in your postcode or nearest large town name and it will bring up support groups near to you.
Hope this is of some help for you to get the best out of the Mac community.
