I haven't had a period for 3 months. im 43 years old. i feel tired and i can't sleep. dry skin. joint pain. whats going on with me?

Could be low thyroid: Hypothyroidism, (an underactive thyroid) could be causing some of your symptoms. There are other potential causes as well, so you should see your doctor for an evaluation.

Many possibilities : Including menopause, depression and hypothyroidism, but any chronic illness can disrupt periods and sleep.

Unsure: This can't be diagnosed without a medical assessment. Once a woman who is usually regular, misses three cycles, it is time to be evaluated. Am assuming you have a negative pregnancy test.