Have you revisited this OML recently? Often, restrictions are put on medicals from a while back when less was known about a particular restrictive issue. If you can find medical info which helps your case, along with a specialist in the field to argue your case, it has to be worth a try and appeal to CAA to look again into your restriction. Unless its something which will always be a restriction. Check CAA medical web page for more details. Also try asking this in the Medical section. It will probably be moved there anyway. Good luck but don't just accept the present status if theres a fight can be fought.