Sorry if this has been asked before, but I couldn't find it. I have a header with a horizontal rule in my document. This works fine, except where there are section titles immediatly after the header on the page. There simply is not enough space after the decorative line for the title to go -- it collides and looks awful.
Here is what I mean:

See how the title collides with the line?
My first question is: how do I make the gap underneath the line bigger? I know I can make the header area bigger with \renewcommand{\headheight}{XXpt}, but this just moves the line further down on the page.
Currently, I have removed the line, but this doesnt leave enough space between my header and the text, so I wanted to move the header text further up the page. I thought I could make the header size bigger, but this moves the header text DOWN the page, which seems stupid. How can I make the text appear at the TOP of the header, rather than the bottom? At the moment, I have put in blank lines after my text, so that it goes further up the header, leaving a bigger gap.
It works:

But it is obviously not ideal. I have to do it for each column in the header.
So my questions are:
1. How do I leave a bigger gap under the decorative line in the header?
2. How do I make the text appear at the top of the header rather than at the bottom?
Thank you in advance, and my apologies for the length of this post. I would like it if both questions could be answered, as although either would work for what I need, I would rather learn it properly.
Thanks again!