heart rate increase scarily after unusually small H dose very scared any advice?

this past month ive ben half heartely attempting to quit Heroin often just waitin until i get sick to use my last dose wel over the past few times ive had strange symptoms of my heart beatin irregularly befor lastnight nothing scary had happend only minor heart shakes whil emy heart beats regularly after injection. lastnight after waitin 12 hourse sence my last 2 bag dose i decided to allow myself a one bag dose being i had strange symptoms originating from my recent shots ( rash under right peck andafter injection redening of my cheast compleately)anyway after my one bag shot i felt fine relaxed until my heart began beating heavily at a rate of 120-130 beats a min. and not just small but fast beats but intence heart jumping beats that moved my t shirt. i am very concerned as to whatmay be causing this weather its an alergic reaction to new cut in these bags ive been getting sence i was 17(now 19). also that night of the 1bag shot i drank a certin amount of beer more than i ever normally would. im hoping the heart rate was simply a reflection of my blood alcohol content and not a serious bodily reaction to my much loved drug. if anyone could share any knowladge of something like this happening i would be forever endebted to them. i am currently withdrawling 22 hrs without injection for fear of returing heart rate symptoms. i was quite scared for my life and considered going to hospital after minor heart pains after continued increased heartrate<3. as i said any advice on the topic would be more than apprecieated<3:o
 
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