If it is coke, speed or meth it will increase your metabolism due to numerous factors that include elevated hormones, increased fidgeting, increase energy expenditure due to being an over excited nutter. I don't know if ecstasy is the same. You can get this look constantly by being a coke fiend.
In regards to your stomach you probably are more dehydrated than normal, also don't use your views whilst high as what things actually look like.
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