Does Remylin-d Cause Giddiness?

I am 74 years old and had gone through CABG last year. I used to get giddiness from 1 year and after all the test, my heart doctor suggested to go for Vitamin B-12 Test and Hydroxyvitamin D, Serium Test. Test result was Hydroxyvitamin D - 17.84 and Vitamin B-12 - 241 pg/ml. After that Doctor gave 9 mythcobal Ingestion in month an 3-4 calcium infections. Then he prescribed Remylin-D Tablet for 6 months. Still I am having giddiness, then when I shown to neurologist, he said it could be due to problem in the fluid in the ear and advised an head exercise. I am continued Vertin 16 tablet for sometime. Now the giddiness is ok. However my heart Doctor still insisting me to take Remylin-D for another 6 months. I doubt on Remylin-D, is it cause giddiness? Is it safe to take it for another 6 months? Please advise.