Have been not eating much except just a cup of soup once a day. I actually feel really happy doing this, and have done this for about 5 days, I know this is not healthy, but I like seeing the weight coming off. Then I might start to eat again. I get this tightness in my chest where I suddenly have to take 6 breaths in and one out. It can happen at any time such as whilst driving my car or just relaxing and watching TV. It will only happen once, and may not happen again for another hour or so, or even 30 minutes later. I don't feel stressed or anxious when this happens., Anybody had this before?