I'm only 23 and I have quite a few of these symptoms. I was curious if I should have blood test run?

Well I'm 23 and I had an over dose of ecstasy when I was 20. I was rushed to the hospital where they gave me a shot that stopped my heart to slow it down. They did this four times and my heart rate was still at 160 it was at 190 when they started.They said I had an SVT a Super Ventricular Tachycardia. The last time I had blood test run was during this event and they said I was completely healthy. Quite often now I get short of breath and get warm and agitated feelings in my left arm. I think my circulation is weird or something. It makes me nervous and break in to cold sweats. I was curious if you had any thing to say that might help me ease my thoughts. Thank You