I have been recently experiencing nausea, swelling in ankles and feet. I thought I had a uti, went to medexpress and got an antibiotic, but my culture came back clear. I had bloodwork about 1 and 1/2 years ago and it came back perfect. No problems with any internal organs, etc. I am a female, age 42. Is this something to be concerned about, and if so, any ideas on what it could be?