Perhaps you were injected with the corticosteroid Triamcinolone (Kenalog) during the procedure as well.

I had major side effects from the injection during my MUA, the most troubling were the cardiac ones. I had restlessness, pounding, racy heartbeat, pounding in my ears, sleeplessness, agitation...
The effects took awhile to wear off, and I did not seek medical attention at the time as I was done with the entire medical profession. I did keep a daily journal of vital signs and symptoms (I am a nurse). I had said I did not want that injection but the Dr. insisted.
My heart rate still has not returned to its normal of 60s/min. It remains in the 80s, though it is a normal, regular rhythm, over 10 months later. I will never forget the pounding, sustained 120s/min! I did report it to the FDA, as the literature definitely dismisses side effects, and folks are talked into cortisone shots all the time.
https://www.mayoclinic.org/drugs-supplements/triamcinolone-injection-route/description/drg-20074674
Side effects could include:
Aggression
agitation
anxiety
blurred vision
decrease in the amount of urine
dizziness
fast, slow, pounding, or irregular heartbeat or pulse
headache
irritability
mental depression
mood changes
nervousness
noisy, rattling breathing
numbness or tingling in the arms or legs
pounding in the ears
swelling of the fingers, hands, feet, or lower legs
trouble thinking, speaking, or walking
trouble breathing
weight gain