In reply to geordiepie:
Your friend will struggle to get much help unless it is a very recent case of Lyme. Knowledge of longer term Lyme in the UK medical system is extremely poor. My wife has Lyme due to insufficient early antibiotic treatment which led to the disease lying dormant only to surface years later. She had the bullseye rash, positive blood tests and the early symptoms, a lot of sufferers have none of the above. She has Lyme carditis, which has been highlighted recently by rugby player Matt Dawson.
It took over a year of seeing many doctors before we got a diagnosis. She is loads better now, but only after two years of antibiotics ( paid for privately).
Lyme effects everyone differently, common misdiagnosis include CFS, fibromyalgia, MS, and many more.
I agree that the Facebook group may sound pretty mad but there are a lot of ill people in it willing to try anything after being shat upon by many health professionals.
I recommend your friend gets researching with a very open mind, treating long term Lyme is more about management rather than a cure, symptoms will come and go unfortunately