If one adrenal gland is taken during a nephrectomy does adrenal insufficiency become an automatic condition Can the other adrenal gland continue producing enough to keep the patient from insufficienc?

I am an eleven year Survivor of adrenocortical cancer. My right adrenal gland was surgically removed and this has been my experience that hopefully may be of some value to any of you that have had a similar experience. I felt OK for the first two years out and this may have been due to a juicing diet that I participated in for about six months after the surgery and observed off and on for the next couple of years. From year two to now I have been very gradually losing my interest in doing new things and just, for lack of a better explanation, do not feel good. I have that feeling of weakness, lack of really being able to put out the necessary effort that is required to do most thing mental and physical that I used to do. I am 65 years old and by comparison just am not able to keep up with others my age while keeping in mind that one might expect to slow down some at this age...but just not this "much". I wonder if anyone else has experienced this? I have nearly lost the use of my abitity to write. I am left handed and my hand shakes and feels to weak to enable me to write legibly. Also...I experience terrible neck cramps and siezures often especially when I am under stress. Very much looking forward to maybe hearing back from someone who can help me make sense of this debilitating condition.