Glad you at least gave it a try, Catrin. I am still loving the Jamis you sold me, so that, at least, was a win-win!
You've probably answered this before, so please forgive me if I am being forgetful, but have you considered a recumbent? If the issues you are dealing with are primarily/all upper body, that might make a huge difference.
It's great that there are many other activities you can still do and enjoy, but I know many cyclists who have switched to recumbents (either trikes or 2-wheels) and have been able to continue cycling despite chronic injuries.
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow