Unfit for Service-Gutted

#1
Just found out that my application has been refused because i had eczema a few years back that was brought on by having to put me hands in paint thinners at a previous job. I read sum of the previous posts advising people with the same problem to appeal but what are my chances of over turning the medical wings decision? I feel shit after running me bollox off for for the last 3 months for fcuk all, just because of a fckunig rash the size of a stamp!.
Any advice or any experience of appealing much appreciated.