Hi. I Had A Sudden Onset Of Pain Above My

Hi. I had a sudden onset of pain above my left knee Friday morning. It has been difficult to walk, stand and move my leg. Yesterday, it began swelling. I have not fallen, twisted my knee, or hit it on anything. At first I was concerned I possibly tore something without knowing it, but last night my mom suggested that it could be a blood clot. I was diagnosed at the ER with vertigo 2 weeks ago today. This weekend, the dizziness has worsened and I am also very tired. I do not have insurance and have just gotten the ER bills for the trip for vertigo which was over $7,000. I am debating the need to go. Any advice?