Diziness. Make her diziness go away?

Hello , my sister is 36 years old and was put on a drug called dinogest for her Adenomyosis due to her painful period pain but after taking that drug she has continues DIZZINESS which the doctor said was vestibular migraine, it was a side effect of the drug and now she is almost bed ridden for 6 months even after stopping the medicine, also one of the allopathy medicines work on her for eg. Vertigo medicines, beta blockers, pain killers , motion sickness medicines - Infact they make her more worse. Her MRI brain is clear and so is her EEG, also the doctor did the Epley manoeuvre which also didn't help her, she is really suffering and needs help!! Can someone suggest me any medicines which will not have a side effect be it herbal , natural , anything at all which will make her dizziness go away??? Thank u in advance