If you were dreaming of needing bathroom and not finding one, the dream interpretation is that you require something tangible or intangible in your waking life. You had been searching for this quality or material. As you can’t find it in your waking state, the problem appears is your dream, as a continuation of your situation in your waking hours.
If you wake up from this dream, you may find that you do need to use the bathroom. The dream was a warning to tell you that your bladder was full.