What Causes Soreness And Swelling In Labia After Intercourse?

My labia became very swollen and sore immdiately after having intercourse last night. Have been having symptoms of itching that come and go over the past few weeks but nothing else. Went to doctor and they said I didn't have a yeast infection or bacteria vaginosis. The swelling has gone down somewhat this morning, but there is still an itch and still pretty swollen. Have been using a condom with my partner for the last few months. Thought the itching was due to sensitivity to latex. But swelling occurred last night, after we decided not to use a condom for the first time....My labia have never been swollen like this before. I am 38, 5'2" and 115 pds. Healthy.