Hi, Welcome to healthcare Magic! Hydroxycut is a herbal preparation while slimquick is based on caffeine based plant extracts and other additives. If you develop symptoms after starting these medicines, probably your body is reacting to these medicines. They can cause mood swings, gastritis, high heart rate and hypertension and lack of sleep in some people taking them. About your shortness of breath and renal area pain you should visit a physician and get investigated. It can be some unrelated trouble also. Meanwhile you should avoid all these slimming treatments. If your physician finds it suitable then you can later resume the weight loss saga. As a safety precaution rule, body weight should be reduced in conrolled way and slowly so that your bodygets adjusted to new changes and there is less chances of regaining the lost weight. I hope the advise would be informative and useful for you. Take Care!