Hello [@louiseAD]‍ and welcome to the forum. 

I'm sorry to hear that your brother is struggling at the moment. It's natural that you're all feeling so worried about him at the moment. Have you spoken to the team that are looking after him about your concerns? 
I don't think we currently have anyone acctive on the forum who has the same diagnosis but if you use the search function (magnifying glass in the blue bar at the top of the page) to search for DLBCL you'll see a number of posts. It may be that if you post a reply on one of those that you'll get a response from someone with shared experiences. 

It may be that you're able to connect with others via a more specialist support forum such as the one run by Lymphoma Action. 

If you'd like to talk to one of our nurses for some support and advice then  you can call them on 0808 800 4040 (Monday to Friday 9am to 5pm). 

I hope this helps. 
Best wishes, 
Jenn
Cancer Chat moderator

Thanks so much for your response Jenn. There is so much warmth and goodwill on this forum.

All my best

Louise