Had dizziness over a year someone please help!

My Sister is 50 and she's diagnosed with BPPV. At first, she's vomiting and extremely nauseous. We brought her to ER twice with the same symptoms. She was diagnosed with Vertigo in ER then released after couple of days. She can't walk alone and can't function at home. I emailed her primary doctor to check into it because she just can't be taking meclizine and zofran every day. It was just a temporary treatment. Her doctor referred her to a Physical Therapist. The first session she threw up twice but feeling better the next day and on the 2nd day much better. She can walk alone. She said, when she turns her head to the right, she doesn't feel dizzy anymore but on the left side, she's still feeling dizzy especially when she look down and also turning her head to the left. She suffers this problem for 1 month and half. After the second session, she didn't feel dizzy for 1 full day but there's still light dizziness in certain position. We ask for 3rd session which is tomorrow. I will let you know how she feels 2 days from now since the effect of the exercise will be the next day after the session. I hope her experience helps a little in your case if it is BPPV.