Linux: monitor my own internet usage page by page (url by url).

Hi all,

I have a monthly broadband subscription which rolls over on the 23rd
of each month.

I had arrived near the end of my usage so I was carefully checking
that I didn't go over my limit - they crucify you for excess usage!

So, when my usage didn't roll over on the 23rd, I rang them
to check what was up (turned out that it was due to their
end-user web interface not being entirely not up to date
- they're quick enough to bill though!).

Now to the question - the agent told me that I had used 2.5MB
(or similar figures) PER PAGE just to check my usage (the only
pages I had accessed on the two days in question). To say I
was shocked is an understatement. These are not fancy pages -
v. little graphics &c.

So, now I want to check up my internet usage (per page).
I don't want something that I have to monitor continually,
rather keeps a record, preferably something I can put in
a database or at least a spreadsheet.

Is it possible to do this with tshark/Wireshark?

What I'd like ideally is a daemon (I know that I can do it
from a terminal as a background process).

If it is not possible, can anyone point me to useful Linux
tools in this domain? I have Googled and the only thing close
is tcptrack here.