Hi Kev, I went to Europe last winter for 4 months last winter and hopefully will do the same this winter.
I could not get travel insurance for 'arach' per say as it was considered preexisting but was insured for anything else that might have happened.
Check out the US Embassy website even if you are not American for the country you are going to as they usually have quite a complete list of doctors and specialists who speak English.
I went with photocopies of my Rx's plus the doctor did a medical summary for me which I made a few copies of.
When I booked my ticket I asked for a special seat with leg room plus assistance boarding and changing terminals, this worked out really well and I'll certainly do this again.
I kept all my meds. in my carry on.
Keep your meds. locked in your hotel. You'll do fine, just pace yourself, Europe for the most part is quite advanced for those with handicaps compared to where I live, kindly, Aly