Panic attack vs Hearthattack

Hi everyone.. I was diagnose with anxiety, at early stage of my anxiety i always worry that i might have heart attack or stroke, then it switch to fear or worry that i might become insane... i consulted my physician and after all exams and test she gave me antidepressant, after recovering for that fear , i was diagnose with hypertension in our company during annual physical exams... although not to high 130/90, she gave me a pill for hypertension since i have a family history of disorder.. After two weeks of taking the medicine, those dizziness, weakness are gone and i feel better. But anxiety still in my mind and attacking me sometimes.. i had a series of exams, 2d echo, stress test, blood test.. all of them are normal..
Last sunday while competing in the fun run for 10k (i run 3k twice a week regularly) i feel strong.. But after the run while eating i feel difficult in breathing theres no pain in my back or chest but its difficult to breath and palpitations was present... slight or almost no dizziness.. so i decided to go home to not create scandal in the public but i know i am not ok... when at home, it still difficult to breath so i change my clothes and rest for 10 mins and lay down.. after laying down for 30 mins i took my BP, its 130/70. and after a few more minutes i feel better again as if theres nothing happen. I decided to go to mall and have a shopping with my son for 4 hours and yet i am not tired.. What do you think it is????? is't panic or mild heart attack?

yes its true. the mind can do strange thing. last night after taking my meds prescribed by my physician , anxiety run again into my mind that what if my blood pressure went too low that will cause me to collapse. I have a slight difficulties in breathing and i feel that its hard to swallow.. so i sad to my self that i am ok and everything will be fine.. after that i feel good and had a good chat with my friends.. i know its good to educate ourselves when it comes to our disorder but searching too much our disorder causing anxiety.