My t waves in my ekg were upside down in one part. but the rest of it looked fine, does that mean heart attack?

Not necessarily.: Do you have a copy of the 12 lead? This is what is normal in T-waves. T wave should be upright in leads V2 - V6, inverted in aVR. Here is a link to a detailed description: http://meds.queensu.ca/central/assets/modules/ECG/normal_ecg.html

T and sympathy: T waves alone do not mean heart attack. You need to see the whole ECG. T waves absent other abnormalities are quite nonspecific.