I doubt anyone on these forums would be able to give you any definitive answer, FAA route does not really help you if you want to work in Europe, you can't work in USA, because of visa restrictions.
However would contact the CAA, and explain them your situation, probably get a report from your doctor confirming all as you have explained. I am not expert, but have found out that CAA medical are a lot more understanding than maybe many might think.
Another issue that might pop up, is for a job interview, not sure if there are ever any questions about previous drug dependency etc., again good advice might be gained by speaking with a doctor from the CAA medical department.
Any answer from this boards, will mean very little, unless it is an AME with extensive knowledge. Another you could contact could be an AME, he might be able to contact the CAA for you, to find out their position on this.