What Causes Dizziness,cough And Nose Bleeds In A Child?

My daughter was sent home from school on Monday. At first she had a bloody nose since she s had a cold with congestion and coughing at that point for maybe 4 days. Later she vomited at school and was sent home. She felt better after sleeping on Monday and felt more normal late that night. She woke up at 4 in the morning on Tuesday but was just continuing to cough and have congestion. Late Tuesday night she had another bloody nose. We stopped it with pressure and a cold wash rag. She slept with a humidifier in her room. I m also trying to get her to use the saline spray and not stick tissue in her nose to sometimes make herself sneeze. I m also trying to get her to drink water. We put a little vaseline in her nose to moisten it last night. I woke up at 4 this morning again also and heard her coughing and moving around in her bed. She then stated that she was dizzy. I got her to sit up slowly and put saline in her nose and blow gently. I then gave her some mucinex and had her eat some apple sauce and drink water. I m not sure if she should see a doctor now because I generally wait a week and a half but I m concerned due to dizziness now.