Can anyone help me ...

[♥Miss♥]

Ok im 26 year old male athletic all my life ever really experinced type of weird feelin sany thing i thought i was normal heathly kid, i got outta the navy in november of 2009 stopped working out didnt do anything but lounge around wasnt dieting right doing nothing wasnt drinking or anything but just being lazy so to speak...well then i started gettin depressed and one day i forsure thought i was having a heart attack so i went to the er had everything ran ekg blook work chest x ray everything, everything fine... still i thought something was wrong with me always thought about dying and everything i dont know why well my i went to see a doctor he gave me sentraline?? i guess thats how you say it i was on it for like a month went on a trip and forgot to bring it well i felt fine that whole trip so i didnt take it when i got back..i recently moved out to virginia and have been experioncing like like a light headedness and shaky at times..i dont know if my aniety is making it worses or what....but when i eat something i tend to feel alittle better but i still just feel kinda like i could pass out but i dont...does anyone know what coud be wrong and should i go to the er?? thanks in advance for your advice