I was sectioned on 20th August 2014 and kept there for a month.
The staff in the psychiatric ward told me I wasn't in any pain and on one occasion refused to help me up after I'd fallen over due to a reaction from the medication they forced me to take. They forced me to walk around despite being bedbound, if I didn't walk to the cafeteria I wasn't fed properly. They would lock me out of my room to force me to exercise more.
After I was discharged I made a complaint because they made my ME permanently worse, in their response they classed my incarceration as a success story because they saw me walking around and talking to other inmates/patients. They said because nothing showed up on tests it was only logical to assume it must be psychological. My complaints were over-ruled and they got away with it.
This is probably too much for a solo project, but with a ME/CF group it can be done.
1. Don't let them off
2. Don't give up
3. Write everything down, with dates, times and details.
4. Organize, get some publicity. There are methods for doing this, one needs to get some press contacts.
5. Assemble an email list. If you have 1000 people in the list, a hundred may be willing to call/write/demonstrate in public. 100 people can do 1000x more than one.
Of course it's easy to type "Go do that!", not so easy to do it. I haven't done any of that myself.
I do see that groups/causes that get results do it by pushing TPTB to heed them, not by asking nicely and waiting. It's not in my nature to be demanding, and I've found (surprise, not) that bureaucracies respond by giving the back of the hand. I think you have a great story, it needs to be combined with others like it and told in public.
I'm very thankful we don't have NHS in my country. Yet.