Hi Catrin
Sorry to hear of your dilemma. 
If you've got a bit of time on your hands at some point, my friend Helen's blog may be of interest. Due to a problem with one arm so that she can't put weight on it, she cycles (extensively!) on a series of recumbent trike. She doesn't talk much about her health problem on her blog, but you can get a feel for all the types of riding she does, here in the UK and in Germany, with the trikes.
All the best
Rebecca
Riley - custom 2014 Enigma Etape
Bridget - 2010 Surly Cross Check
Lorelei - 1979 Puch Princess mixte
Astrid - 2014 Viking Bromley singlespeed mixte
Lucy - bespoke 2012 Brompton S1L
Visit my blog: velovoice.blogspot.co.uk