What Causes Vertigo Along With Palpitations And Nausea?

I WAS FAINTED LAST WEEK DOC, THEY GIVE ME ANTI VERTIGO( BETAHISTINE ) DURING I WAS IN THE EMERGENCY ROOM, MY HEARBEAT BECOME FASTER AND THEY INJECT ME FOR THE DIZZENESS THEY SAY AND FOR THE STOMACH. THEY ASKED ME IF I VOMIT. ALMOST, BUT I DIDNT. I REPLY. AND AFTER THAT, I FEEL THAT IM LIKE A CANDLE, SO MANY PAINS I FEEL, I LOST STRENGTH, AND EVEN MY KNEE CAP WAS PAINFUL. I DONT LIKE THE LIGHT WHY? is this vertigo can cure? is this for a lifetime? even to take anti vertigo med?