Hello friend, and we do understand how you feel.
Anxiety and panic can be really tough. All of those symptoms you describe are anxiety/panic symptoms. Even though they make you feel like you are having something serious, it's not the case.
And all of the panic sufferers who own cats do feel the same way
My cat rarely comes to me but when she comes I do think the same xD then again my cat goes to my husband a lot and this time I am like "hmm..." lol
what I am trying to say is, we can use any situation to feed our irrational thoughts.
Like others mentioned before, please consider treatment options and if medications are offered, give them a chance. Medication treatment got rid of my panic disorder two different times in my life. in addition to it, therapy is going to help a lot.
Feel well soon