Borderline normal symptoms and conditions

ok i wrote a few post down (25y/o cutting his pillls in half)

had ugly side effects with 10mg.. (heart pounding, retrograde ejaculation)
after 4 days of cutting my pills in half from the 10mg to the 5 my symptoms have gotten better... the cough has gone.. right now i have a raspy breathing that comes and goes.. I do have some weird stomach pain stometimes like if someones pulling on my stomach and it feels like a slight discomfort... I been monitoring my blood pressure and it has been excellent.. spanning from 116/65 to 135/81 highest.. My heart beat was a little fast yesterday but now im pretty good.. i have random chest pains still.. Should i be feeling this if im just getting treated for hypertension.. I mean i didnt have a heart attack and my EKG showed borderline normal. i had a slight arythmia.. They said nothing serious..
Im kinda scared cuz well like my girlfriends dad just died of a heart attack instantly (first attack hes ever had) and he was a healthy guy abs, worked out everything.. he had chest pains all the time and would go to the doc and they would tell him hes fine.. just had high blood pressure.. these kinda stories make me nervous :( anyone have any insight?