Thanks for writing us..
reversibility of pumping action is determined by stress
perfusion test that is usually done before angioplasty
in case of LV dysfunction. You have not mentioned that test.
But if myocardium is viable certainly it can be improved after angioplasty and with drugs like B blockers and ACE inhibitors, spironolactone
Water restriction will be there till your heart pumping capacity is improved and since you are diabetic have to follow diabetic diet lifelong.
If any other querry , will be happy to answer