(1) "they" will rarely offer information about anything but are only TOO willing to give it if you ask. I think French people tend to just "put up and shut up" whereas us UK lot like to know whats going on and why!
(2) make sure you are registered on the Maladie Longue Durree (MLD). This should entitle you to 100% reimbursement for treatment and the use of a VSL - sort of paramedic taxi - to get to and fro from hospital. They like that because it ensure you get to the appointments (the driver will take you up to the ward to make sure you do not wander off!) and you are not a danger to others on the road. Means you can relax on the way home too.
(3) Make sure you tell them of the pain levels..pain management is a big thing over here and also if you are feeling sick or constipated -or the other extreme..again also can be controlled and is necessary for a good outcome to your treatment.
Good luck and please keep in touch...we will answer even the most seemingly idiot questions as we have "been there and done that" somewhere in France!