Palpitations and anxiety. Case study.

I am kidney transplant patient 6 years on immunosuppressive medicines.. From last 6 months feeling palpitations & anxiety in left AV fistula hand,left shoulder below chin & left side neck.. It happens whenever there is stress, anxiety, more pressure on fistula hand,more walking any physical exercise etc.. It really makes me worry of getting paralyzed or heart attack. Have done ecg seems normal (only showing lvh) consulted cardiologist no problem with the heart.. Dnt know it's really worry me everytime I get this veins palpitations, mild pain in left hand with veins pressed down n up ,legs palm pain.. I am worried if there is some problem in any of my left veins...When I gulp feels like no sensation in left neck veins.. Plz help me to consult right doctor in South Mumbai who is expertise in treating transplant patients with this case study.. Thank you from Aamir