Urinary frequency have anything to do with a bun/creatine ratio of 31 and a bun of 26 or was I just dehydrated?

Thanks for asking! Could be 2 different problems, for example dehydration and urinary tract infection (uti). Worth looking into further, as elevated BUN is not typically present with frequent urination.
Dehydration? With a bun:creatinine ratio of 31 and with a BUN of 26, your blood creatinine was .84. That may be normal for a female your age. If you were dehydrated, your sodium and chloride would be elevated, were they? If they were dehydration would be the most likely cause. Were you not able to ingest fluids?