Any advice ?

So if you follow me you know I’ve been dealing with somethings well , frankly in the middle of my chest between my breasts I always get this little jabbing feeling, I’m not sure why if anyone could tell me why? Then sometimes it’s like a muscle that’s being strained on the top of my left breast, does this happen to anyone else? I’m 20 years old, I was in the hospital 3 weeks ago cause I thought I was having a heart attack because of the jabbing & weird feeling in my left arm. Any advice ? Did it ever happen to you?