My 19 Year Old Daughter Has Had A Lot Of

My 19 year old daughter has had a lot of pain in her joints which usually happens when she gets her period however last week it was so bad she went to the doctor who prescribed her pain killers. He period has stopped but the joint pain hasn't and today she was very dizzy and disorientated at work. She went to the doctor who has prescribed her anti inflammatories and told her to take them for one week. She had spent time in the tropics in December and I think there is a possibility she may have contracted Ross River virus but the doctor has ruled it out as he said six weeks have passed. I think she needs some blood tests??