Thanks for the additional details. Having gone through your descriptions, I feel that since you have already been examined thoroughly for any intracranial problem with a CT and MRI, and nothing has been found to be abnormal, it is perhaps not related to the brain.
Now since you have mentioned that you have a feeling of someone whistling in your ears (tinnitus), and that you have nausea but nothing comes out, and that you a feeling of a little pressure in your ear, and also that sometimes your hearing is not clear, these symptoms of unsteadiness (unbalanced) and lightheadedness are therefore related to an ear problem, although it might have been checked and cleared by an ENT specialist. Perhaps your symptoms would not be so marked/ severe so that it might have missed out.
The numbness in fingers is perhaps because of a pinched nerve in your neck. It would do you good if you could get it checked up as well.
Notwithstanding, I think that it would do you good if you could recheck with the same or with some other ENT specialist and get your ears examined thoroughly including some tests for the inner ear. I think that the following possibilities should be explored/ ruled out:
(b) Meniere’s Disease
(c) BPV (Benign Positional Vertigo)
Having said that, I think once you check in with your doctors, they would be checking your sugar profile as well. It would do you good if you could start eating better, as maybe a low sugar level at times would be aggravating this issue.
I hope that it helps. Best wishes. Kindly feel free to enquire if you have any remaining concerns or doubts and it would be my privilege to try helping you as much as I can.