You would be best checking out the TRAVEL INSURANCE Q&As topic in our General Holiday Enquiries forum.  Page 1 of the topic lists recommended insurers who provide cover for pre-existing medical conditions.  
Please feel free to post any specific questions there for a better response.
I will close this topic to reduce duplication.
Good luck, I hope that you will be able to find adequate cover at a competitive price.
David
 
                
                
                
                                    
            
            
        Please feel free to post any specific questions there for a better response.
I will close this topic to reduce duplication.
Good luck, I hope that you will be able to find adequate cover at a competitive price.
David
 
                
                
                
                                    
            
                    
                                    
     
            
    
                
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