Pagination Problem

I’m having trouble with pagination.
Everything works fine, even pagination except that
I can’t seem to stay on the same page.
What I mean is I have a “News” page which shows one post (title+content),
the most recent post when you first open the page,
followed by a list of 5 posts, let’s say posts 1-5 (just titles).
If you click on any of those 5 posts,
the content on top would change to that.
But when I go to the next page to see the list of post 6-10
that’s when the problem starts.

I want to display the most recent post (title+content)
from those posts, in this case 6-10. But currently
it shows whatever last posts was clicked.

Also a bigger problem is that when I click on any of those titles,
it would show the title+content of that post, but the list at the bottom
would change to the first page.
What can I do so it stays on the same page unless I click on next or previous???
Please help!!!

this is the code that I currently have for my single.php

[Code moderated as per the Forum Rules. Please use the pastebin]