Hello! After having thoroughly reviewing your problem, I would like to suggest you that
1) Your symptoms of pressure in the head & throbbing associated with right arm pain
may be due to either the medications ( vasodilators, nitrates, CEI, ARBs, Diuretics ) or orthostatic hypotension
attributed to the cardiac disease causing dilated cardiomyopathy
like aortic regurgitation
, IHD learning to reduced diastolic function. So, you need not worry about the symptoms.
2) But, as you must be already aware about poor prognosis of dilated cardiomyopathy, I would suggest to continue the medications & have a regular follow up with your cardiologist.
Thanks & take care of yourselves!