There is a reason these things don't work for you. They don't work for anyone. If patches, pills, gadgets, etc. were truly that effective, health care professionals would recommend them to their patients, everyone would know about it, it would be all over the news, insurance would happily pay for it, and no one would be fat. There are no weight loss secrets - if a product really worked, it wouldn't stay a secret long and manufacturers wouldn't have to beg you to buy it - its results would sell it.
Fad diets don't work (at least not in the long-term). Creams, patches, pills, oils, sprays, powders, and other gimmicks don't work. The only thing that works is taking in fewer calories than your body needs to maintain its current weight. If you look at the advertisements they ALL say "when combined with diet and exercise..." OF COURSE - that's because diet and exercise is what is causing the weight loss.
Don't waste your money - skip the hoodia.