I am a 32 year old male. I'm not overweight. Rapid heart rate. Flip flopping in chest. Nausea. Dizziness. Shortness of breath. Can't run. Pain.?

Cardiac irregularity. You may be developing blockage in your coronary arteries or you likely have cardiac arrhythmia. This may be a manifestation of abnormal thyroid or more serious conditions, talk to your primary care doctor immediately.
Go to the doctor now. Many things can cause rapid heart rate and the sensation of 'flopping,' which is sometimes called a 'palpitation.' However, when associated with nausea, dizziness and difficulty breathing, and with or without chest pain, it really deserves an immediate doctor visit. That is, if you're having symptoms now, go to the ER. Even if your thin, heart disease can occur.