Racing heart, dizzy, nauseas, shaky, lost 5 pounds when i woke up in the morning. i had eaten last night. what could be wrong?

Dizzy: Other than your gender being female, we have absolutely no other information about you not even your age let alone any medical history or medications. How did you lose 5 pounds over night? Are you 90 or 12? are you pregnant or post menapausal? Too many unknowns to form a differential diagnosis. Please see your doctor.

5 pounds in one nigh: It sounds like you should be evaluated in person. I don't understand how you lost 5 pounds overnight. The best thing given your symptoms is to be seen by your doctor or at an Urgent Care clinic.