While getting a diagnosis is never a good thing. In this case it is. HCM is not commonly known and often mis-diagnosed. Many go years thinking they had other issues when it was HCM. Knowing this, it allow you to take the proper steps to get care. First - Be very cautious of what you read on the web. A lot of sites really put a dire spin on it, when in fact, 80% of those who have it, don't know it as it really hasn't affected their lives.
For expert advice, you came to the Mayo Clinic site and there couldn't be a better place to get information. The US is a big place with many excellent medical facilities, but very few have the expertise, knowledge and research abilities to properly treat HCM. The Mayo Clinic is an excellent place to learn about your new condition.
I hope if anything, that this gives you hope that HCM is treatable, and most of us live long lives (with proper care). Go learn more, seek as many opinions as you can. This will help you understand the disease, its treatments, and how we learn to live with it.