What Further Steps Should I Take For Persistent Palpitations And Sleep Disturbances After Receiving The CoronaVac COVID Vaccine?

Hi, I m a 42 years old woman. After the first dose injection of covid vaccine ( CoronaVac, chinese) , intermittant palpitation attacks persists on for approximately one year. Especially , after meals and when I wake up from sleep. A sleep disturbance came so after. A Cardiologist performed ecg, echo, holter ritm and holter tension analyse and ecg by effort. He s found nothing except mvp, but I have mvp for many years... He offered propranolol, then metoprolol...they both didn t work. An Internal medicine expert performed many tests, thyroid function tests, CBC, biochemistry panel tests, ogtt for 3 hours by 100 gr oral glucose, homa-ir and etc. All s o.k. What should I do more? Thanks a lot...