Who diagnosed you with OCD? A trained psychotherapist, or your regular doc? You want to get into therapy so you can work on your thinking, one who specializes in anxiety treatment so you can get a correct diagnosis. As for the heart stuff, it's impossible to truly know if you have a heart problem, but at your age, it's so unlikely, and the symptoms you describe don't sound like a heart attack. If you're that concerned, your doctor can perform tests, but your more important and likely concern is your anxiety.
Hi there ive been diagnosed with health anxiety also it started in october 2015 first panic attack never had i experienced one and from there on ive had chest tightness, Muscle cramps and spasms, in the arms and hands go numb my face also goes numb and headaches that feel like u have migraine its the symptoms that trick u into thjnking its a heart attack or stroke thats what messes with your brain currently im only on one med wich is buspirone and the amount om taking is 10mg every night when they started me on that med the first 8 weeks i felt lots of thise symptoms now 4 months later i just get spasm and headaches every once in a while chest pains that come and go but yeah still anxious just not as when i started in ocotber