I had glandular fever two years ago, now i have swine flu. Will taking Tamiflu have any effect on me?

I had glandular fever two years ago, and i got it quite seriously. I spent a month off school and a week of that in hospital. Now, i have had four days of being very ill, and my mum rang the NHS and flu helpline and both the people she spoke to said I am showing symptoms of swine flu and said to take tamiflu. Will taking Tamiflu have any side effects on me because i had glandular fever?