Hi The Sports Guy,
Welcome to the forums and thanks for your post. I too am happy that you're in remission! I'm sorry though that all of this has left you with this fogginess and difficulty concentrating. It must be so frustrating to live with.
I'm glad that you have such a strong support system, but it makes sense that they don't understand what you're experiencing, given they haven't been in the same boat. The people who have been in the same boat would be people with cancer - it's so hard to grapple the idea of fatigue if people have never been through something so long-term.
You mentioned in your post that you saw a psychologist, but have you ever talked about this with your psychologist? It's nice that he's content with how things are going, but you're not, so I really encourage you to bring this up.
One thing that you might be open to is a webinar by the Cancer Council NSW. They run them every now and then free for anyone who wants to watch. I watched one in 2017 that was aimed at the general public talking about fatigue. They had a few experts on there as well as someone who'd dealt with it too. If you're interested, it's "Fatigue after Cancer Treatment – “What can I do to stop feeling so tired?”
Read more at https://www.cancercouncil.com.au/get-support/webinars/#tg6ohCcUfl7edEEK.99
I hope that this helps, or that your psychologist is able to better work with you to make things easier.