dreamer,
That's a tough question because the Renin>angiotensin> angiotensin-2 system has SO many effects. It influences insulin release, growth of collagen tissue and can even effect the shape of the heart (remodelling.)
Weakness and fatigue are quite common.
Blood pressure is only ONE of the many effects of Angiotensin-2, and even the converting enzyme, ACE has many functions since it is KININASE and affects the production and breakdown of many prostaglandins/histamines all over the body. Messing with this system is SURE to provide all kinds of side-reactions, probably many that are poorly understood, in ADDITION to the dreaded COUGH!
That's why ARB's are less bothersome...the intervention is only made at the level of blocking the attachment of Angiotensin-2 and most of the other interactions are avoided.