Probably. If things get worse, you should check a doctor
Sympathomimetic agents. Sympathomimetic agents stimulate the sympathetic nervous system by prompting the neuronal release or mimicking the effects of epinephrine, norepinephrine, and other catecholamines
yes because exertion of the heart increases and makes you lose weight
No, I don’t think that’s possible. You can instead try to change what your eating in order to better yourself.