You ask if your symptoms are related to anxiety. Since you have had extensive testing of your heart and other body systems and have gotten the 'all-clear' there, and since you are very young--and since you have been diagnosed with anxiety and depression--it is very likely that your symptoms are indeed related to your emotional state.
Sweatiness, dizziness, panic, fatigue and lethargy--they all fit with depression and anxiety. The exception might be the tingling in the left arm, which could be a pinched cervical nerve (in your neck). Of course, left -sided symptoms are part of heart trouble, but a funny thing about the anxious mind is that once aware of this fact, we CAN convince ourselves that the ticker is the problem, instead of what is between our ears.
It would be a good idea to return to the doctor who is treating you for anxiety and depression to,report your symptoms. It sounds as though you might need a little help in dealing with cardiac anxiety. You can also post questions at medhelp's anxiety forum here:
http://www.medhelp.org/forums/Anxiety/show/71