Do tears or saliva, or perfume entering the mouth and then swallowing the spittle, invalidate the prayer?

It is clear that you are afflicted with waswas (obsessive whispering), so you must cast it away and ignore it. Prayer is not invalidated by anything you mentioned. Since your prayer was not invalidated, it is not prescribed for you to repeat it. Beware of Satan toying with you to lead you into hardship and difficulty.