angina or anxiety? or something else ?

i don’t know what’s happen to me. I have been suffering from anxiety disorder for 10 months.  but all my anxieties are caused only by the symptoms, especially the heart.  constant tachycardia, chest discomfort and many other symptoms.  but recently something new has appeared.  small attacks that do not depend on anxiety, a very strong feeling of tightness and pressure in the chest, most often when I stand, when I stand my pulse is always very high (120-135), and now there is a strong compression in the chest and somewhere in  throat, also at the top of the abdomen.  this pressure is not clearly localized.  it is also difficult to breathe, cold hands and feet, I try to calm, but I am very nervous, it also passes abruptly.  I do not know what is this.  as I understand it, there is no point in doing an ecg at rest, what should I check?  what could it be?  may wear a holter again for a couple of days to identify this problem.  I understand that most likely it is a coronary spasm.  I am very scared and I am very tired of all these problems.
help pls