First of all, you should feel uncertain recently. I think you may feel uncertain about the future, which may come from employment or social relations.
Recalling the past is a very common dream, which may mean that you have some views on reality. Is there anything bothering you in real life?
In addition, the repetition of the same image shows that you have touched something recently, which is related to your memory. It may be a film and television work, a class reunion, a literary work, or someone's influence. Is that so?
I sincerely hope I can help you.