I was listening to R4 yesterday morning and one woman described how it took numerous doctors to finally realise that she was suffering from Lyme's Disease. We have been warned about this tick many times down here in the south, so I never wear shorts anymore or short-sleeved clothing when I'm out and about in my area.
I heard that broadcast too. It was horrifying - her symptoms were horrendous. 14 doctors and several consultants did not think to test her for Lymes despite her son being recently diagnosed and treated. He'd had the classic bulls-eye rash, though she didn't.
Eventually, she paid to be tested in Germany then had treatment in USA - to quote 'luckily I could afford to pay' !!
I'm not sure how effective long trousers and sleeves are in avoiding ticks - they are, after all, designed to catch onto animal fur which our clothing mimics to a degree.
An all over wax and naked rambling might be the way to go