Welcome to the forum Bullekideambule!!
Yes, I've heard it's very hard in France when it comes to lyme. I know of one doctor (Prof CP) but he is quite booked up from what I've heard.
Have you looked into MCAS (mast cell activation syndrome)? I have issues treating the infections (crazy flares), I found combo antihistamines helpful:
https://www.lymedisease.org/lyme-sci-mcas-agony/I think looking into herbs is another good avenue. People can do herbs on their own or combo with abx. So many great herbs out there, for bart could consider things like A-bart (Byron White), allicin, houttuynia, sida acuta, there are many others as well.
Like sandyfeet mentioned, Neil Nathan's book Toxic could be a good resource as well.
Have you ever tried LDN (low dose naltrexone)? this helps some patients with sleep and pain.
Keep hanging in there!!!