No CFS diagnosis for me; although fatigue has been a major issue. The only time I know I was bit by a tick (not deer) was when I was 7-8 years old; I have no memory of a rash. After intermittent but varying symptoms for 20+ years, I had unexplained hair loss and inexplicably gained weight; developed a weakened immune system, chronic cough, vertigo, hives, night sweats, extreme fatigue, and stabbing abdominal pains. I was diagnosed with asthma (not true), PCOS (polycystic ovary syndrome), then low hormone levels and low T3 thyroid levels (all potential effects of Lyme by the way). There's a lot more to the saga than that, but I don't want to bore you.
I think any diagnosis that is called a syndrome or has only been given a name in my lifetime (like fibromyalgia) probably has an underlying cause that is being missed.
I'm determined to recover completely somehow. I refuse to live my life without health. My doctor says in his experience chronic Lyme is curable 85% of the time; I will be part of the 85.