Thank you for writing.
At 48, you are very likely to be in peri-menopause or even menopause itself. The average age of women who start menopause is 52.
Periods being irregular and stopping/restarting is one of the first signs. Menopause is a normal part of a woman's life cycle.
You can read more here (cut and paste): https://www.empowher.com/condition/perimenopause
Talk to your doctor about your concerns.