I have recited in Hebrew to my husband on our wedding day the words that Ruth spoke to Neomi (Do not urge me to leave you....Thus may G_d do to me, and so may He do more, if anything but death separates me from you) We are divorced now. I am afraid that these words are considered to be a vow. What shall I do?

These words are not a vow. May Hashem help you find your Shidduch and bestow happiness to your life.