Okay, here is what you'll have to do ...
It appears your Gmail is invalid. Not much can be done with eBay since you've chaged the Paypal as for AVForums no chance.
Do this ...
Call Halifax for a new card/account as paypal only let's one card per account and I think eBay only let's you have one paypal per ebay.
Get the new card, transfair money over and have the old one closed or whatever. Create a new Paypal and eBay and use a Hotmail address with it. (I had trouble with Gmail a while back)
Make a new AVForum account or use the other one you had.
Change all passwords to something secure.
(tips) this applies to other people.
Here is how I recommend you do a password ...
Think of a phase that's stupid and springs to mind and is easy to remember but is not related to you at all. For example "i like watching tv in the rain"
Now change the spaces to a charcater such as & so it's now "i&like&watching&tv&in&the&rain" or anything else maybe a full stop or comma?
Pick one or two words make them caps, eg "i&like&watching&tv&in&the&rain"
Now add more characaters like ()()[]{}{} eg
"][i&like&watching&tv&in&the&rain)("
And to finsh it a few numbers like 3455
"i&like&watching&tv&in&the&rain3455"
That's how I do my passwords, I doubt any human guess would crack it. A bruteforce would TAKE AGES.
Other tips, only YOU know the password, no one else that inculdes Paypal, eBay or Hotmail. They have no reason to ask you it and if they do it'll be a spoof.
Practase typing it quickly and remembering it.
Make sure it's NOT a word, worse password you can pick, a dictionary attack wouldn't take long. Add numbers to it at have upper and lower case and more than 8 characaters.
If you receive an email asking you to click a link and login hover the mouse over it does it take you to
https://paypal.com?phplogin (or whatever or something) like
http://200.208.11.22/paypal.com?
Day after day people lose thier accounts to other people and probberly have thier banks empied or data distroyed a higher secure password will help prevent that.