Freezer seems to be defroting/leaking?

I have a Candy ecosystem fridge/ freezer.

The top chilling pipes in the freezer close to the door seem to be defrosting the other levels of pipes are ok.

I have found myself getting headaches the last couple of days and thought maybe its from the freezer gas leaking because i get the headaches a while after ive been at the freezer for 2-3 minutes.

Could i have a problamatic freezer?

Thanks

M McN
February 2007