I had a quick look on info on Wilson's syndrome and it looked to me to be a con job, and possibly dangerous. It seems to be mainly based on low body temperature, which some people with underactive thyroid have, but it's definitely not a reliable guide. I've always had low body temp, yet ended up hyper. Body temperate of 98.4 or 37 is only an average - probably half the population have lower, and many people feel tired from time to time, so selling people products based on these type of symptoms only, without proper blood tests is bound to get lots of customers.
This link gives some infohttp://www.thyroid.org/professionals/publications/statements/99_11_16_wilsons.html
It would appear from this, that the supplement sold contains T3 - a potent thyroid hormone, not just a nutritional supplement. This would explain your palpitations and it could cause serious problems if taken without regular blood tests.
It's unfortunate that people like this Wilson chap can exploit other people like this, but the internet is totally unregulated. Forums like this can be helpful, as members can discuss experiences and exchange ideas but do not promote any products or sell anything.