S.W.
I would definitely go back to the doctor. If you are not satisfied, get another one for a second opinion.
Spotting like this for the amount of time is not normal. Perhaps you are going into menopause. But do get it checked out.
I spotted something like this and the doctor gave me a shot. My period stopped for about three weeks and came back. I was scheduled for a hysterectomy. The doctor said I looked much better after surgery than I did before surgery.
Do get it checked out.
the other S.