Energy rating? Bathroom Scales?

Well this week I had a Blood testing- Food Intolerance testing....
My father did this and lost 2-3 stone and overall he feels a lot better...
I have heard other favourable reviews, A lot of people have had very positive results, provided they followed the instructions everyone says it is fairly strict....But I have been feeling weak the last few months so I ll give it a try...
On Friday the 23th November, When I went into the consultancy I was first given a biro like metal probe. Told to hold it.
The consultant then told me I had an energy rating of 3.... considering this should be 35 that was bad. Based on this she also asked had I bowel problems... Yes is the anwer...
Also I was weighed... I weighed 15st 7lbs ok now this is where I had to ask is that correct.I was informed that these are they same scales they use in a coronary care ward in a hospital and the scales are checked every month....
At the weight watchers scales I weigh 16 st 8.5 lbs now that doesnt computate at home I weight 16st 5lbs on one scale or 16st 8lbs.
Now to throw a spanner in to the works. I was at a course during the week and I weighed myself on their calibrated industrial scale and I got 216 lbs or 15st 6lbs aproximately.
What is going on are these three scales wrong or these two right....Its a bit of a conspiracy theory now I know the two home ones are cheap digital scales but the weightwatchers should be accurate...or is it...Im gonna have to check out buying an expensive scales.
The consultant told me feeling better is more important than weight loss...
I just wanna be eating the best possible food to avoid weight gain again....