You may have entered the peri-menopause period. During this time, you will have irregular cycle, and possible symptoms like hot flashes, bodyache, decreased libido. Its usually a transition period lasting 1-2 years. Until your menses stop completely.
If your family is complete, this is nothing to worry about. Some times, of the bleeding is heavy or the symptoms cannot be handled, then treatment in the form of hormone replacement therapy
is advised. About the brown line, skin changes are also common. Sometimes they become prominent. You can apply aloe vera
or vitamin E