You need to extricate yourself as much as you can and as fast as you can and get your finances back together independently from them. Whatever inheritance you would have gotten may very well be gone by the end of this and you need to be thinking of your future since your parents have utterly failed to consider your interests in this whole debacle.

Exercise and eating right (ie; not over-eating) is something you do for yourself, just like your business is something you do for yourself in many levels. You need to convince yourself of this, because it’s true, and find activities that you don’t hate (so you actually do them regularly) and ways of regulating your caloric intake (get energy-dense, low nutrient foods out of your house, cut way back on drinking alcohol, etc). After a few weeks, you should start to see results. Use that as proof/inspiration that what you’re doing is working and give yourself credit for the success.