Will I Be able to drink alcohol again?!
I would have thought so, when you recover. Get well first as you've found out - Glandular fever is very unpleasant. Lasts much, much longer than 5 days and knock on effects could leave you weak for a good year. Get well, soon !!
There's a light at the end of the tunnel. When you have made a complete recovery, you can start all over again.
Do go easy though, especially at first.