I have pain near where I had my appendix removed over a year ago, its a pulsing pain that comes and goes what could it be?

Many possibilities. Abdominal pain needs face-to-face evaluation that can only happen by making an appointment to see your primary care physician or the surgeon who performed your appendectomy. They will ask many questions, perform a careful physical examination, and may recommend lab and/or diagnostic tests. There are simply too many causes of abdominal pain to speculate with this information.
Could be. Could be many things. Best thing is to get an exam. Don't think is anything serious.