Hi,
One of the myths of migraine that is frustratingly repeated by gp's and even neurologists not clued up on migraine (some neurologists specialise in other areas but may see the odd migraineur) is that it lasts x many hours then subsides. Before I got my diagnosis I had been unremittingly dizzy for approx 18 months. When I was finally seen by consultants who truly understand the condition they thought nothing of the fact it was all the time, it simply means the migraine is happening constantly. In the clinic I go to they see people who have constant, unremitting daily pain, rather than daily dizziness. The idea of migraine as a headache over one eye for up to 72 hours is the equivalent of the idea that menopause is just some hot flushes. It''s one aspect of a condition that is much more diverse in its presentation.
Migraine isn't curable but it can absolutely be managed. Mine was for many, many years and is, touch wood, for the most part now again. You need a daily migraine preventative. The drugs a gp is most likely to dispense are propranolol or one of the tricyclics such as amitriptyline. You could try asking for one or other. Take in some literature re vestibular migraine. You don't need to have had migraine headaches for this diagnosis. Retrospectively, I now realise, before the dizziness hit, I got pain in my face/sinuses a few years before, which I now know was migraine, but there are people who just have this happen out of the blue. It took me quite a few preventatives before I hit on the right one. It's trial and error but worth persisting. It can take a few weeks to know if it works.
Ideally you'd see a neurologist like mine, someone who really knows their stuff where migraine is concerned. Remind me of your symptoms. I know when the dizziness hit me I researched the hell out of everything and the options re what daily dizziness can be are limited, which is why I think there's a strong chance it's What you have. My main symptoms were a feeling of fullness in my ears, daily dizziness, lightheadness, brutal brainfog and intermittent, occasional spinning vertigo, this was rare, a feeling of motion intermittently was more common.