Don't feel bad for calling an ambulance, I did when I had it, or at least the NHS helpline got one for me, or at least a medic on a bike as they were all booked up. Can have similar symptoms to a stroke so they don't mess around. Got me some medication and slept off the worst of it just staying at home. Labyrinthitis is no joke, Doctors who have had it describe it as one of the most extreme non life threatening things you can get in terms of symptoms. I couldn't walk or barely even move for vomiting, couldn't sleep on my left side for months afterwards for being dizzy. Luckily made a full recovery after a few months with no tinnitus after effects.