What is wrong with me?

I have had this problem for two years now. It all started on a regular day , went to work and then to the gym , but as i was coming home and standing at my front door i suddenly started feeling very light headed and dizzy(drunken like feeling). I got really scared and my heart started pounding in my chest so i called the ambulance. I went to the doctor and he did all sorts of tests. Heart cardiogram , blood test , urine test and the works. But nothing came out of it. But the dizziness and light headed felling has persisted to this day. All day every day... And as time has ped it has gotten worse , now i cant concentrate , started feeling my heartbeat and skipping beats sometimes many times a day but may go away for a few days or a week and then come back.. Ive seen a heart specialist but he says its normal skipping beats. New symptoms are that i feel tired all the time and have no energy at all especially if i havent eaten for 3 hours i feel like my blood sugar has dropped and i can barely move. I have continued to work out and try to jog a few times a week. Eat healthy , complex carbs , vitamins and lots of protein , Veggies and fruits.. Im at a loss here because im doing everything right but the symptoms just wont go away and its driving me nuts. Im very tired of rushing to the hospital thinking this is the day i die because the symptoms get so bad sometimes. Please help :(