After reading what you said, it seems to be benign positional vertigo (BBPV), that is, otolith. However, because I didn't see you in person and didn't see the examination film (because each doctor's experience is different, minor problems may be reported as normal), combined with your abnormal symptoms of hemiplegia at the time of onset.

Therefore, the following suggestions are made:

1, MRI reexamination of high field head, such as 3.0. Note that there are meningiomas, cholesteatoma and acoustic neuroma beside the brain stem. You can also check for vascular malformation (if your original film is good and the hospital level is high enough, you can not do it)

2. Carry out a foaming experiment, mainly to check the possibility of patent foramen ovale of the heart (it is difficult to detect by ordinary heart color Doppler ultrasound) (this disease is usually a common headache, you don't like it, you can further improve this examination)

3. CTA of head and color Doppler ultrasound examination of neck blood vessels, except the source of blood vessels. Your seizures are irregular and not very similar.

4. Check the 24-hour ambulatory EEG to rule out the possibility of atypical epilepsy.

Because of your long medical history, you have made little progress. Consider BBPV. You can do the above tests one by one, and then rule out the diseases I mentioned, if everything is normal and the report is authoritative enough. It's basically BBPV. After online learning, the method of BBPV reset is effective and diagnosis is made.