Calcium supplementation is a proven treatment for osteopenia and osteoporosis. It is generally recommended that calcium intake in a women with either of these bone conditions be 1200 milligrams daily. Importantly, vitamin D should also be consumed on a daily basis, as adequate levels are very important to the uptake of calcium from the intestines into the blood stream.
Symptoms of elevated calcium level can vary significantly, and often depend on the underlying condition causing the elevated calcium, the time period over which the change develops, and the age and physical status of the individual. Constipation is a well-known side effect of elevated calcium levels, and even mild elevations may be enough to alter one's bowel habits. Elevated calcium is also classically associated with depressed energy and mood, abdominal or flank pain, nausea, and altered mental status (if severe enough).
Given the time course of your symptoms to the start of your calcium supplementation, it is certainly possible that the two are related. You should talk to your doctor
to make sure that you are taking the appropriate amount of calcium supplementation, consider checking blood levels, and discuss the need to add
stool softeners or bulk fiber to your diet.