hi,
thank you for providing the brief history of you.
since you have a worry about the seriousness of the symptoms you are facing I will advice you to meet up a
neurologist and a cardiologist.
a brain scan and a
heart scan will be helpful to come closer to the symptoms.
as you mentioned you have
involuntary movements, loss of coordination,shaking / jerking feeling etc you should meet up the Neurologist and take his advice.
once the brain and heart scan comes normal you may come out of this
depression of serious illness which is bothering you alot.
also discussing with the expert is never harmful, in fact it is more informative.
I will recommend to meet a neurologist and cardiologist and get yourself checked once atleast.
they say - prevention is better than cure.
so the earlier you act the earlier we can come closer to the issues.
with the grace of God I wish you a healthy and confident future