Dizziness, is a weird symptom from my experience…I first got it with stiffness and pain in back of the neck over 40 years ago, when dr. said it was ‘a virus’, and got a purpose made collar made for it as it would return for say a week then off again. Then 15 years on got worse, with seizures that were looked into ( brain tumour, epilepsy etc ruled out), and drs., and later chiropractors, decided it was due to trapped/ squeezed nerve as atlas bone was small and vertebrae became disaligned, and muscles around became inflamed trying to protect site. So lots of dizzines that I got used to, and could differentiate into vertigo with short head spin as moved neck awkwardly ( eg taking clothes out of tumble drier), and instant grab to hold onto something, other times it’s like walking on a boat deck on a rough sea, or being drunk ( without the gaiety).. lasts for minutes while I walk around the house holding onto furniture, or an arm. I have learnt over the years what tends to bring the dizziness on and now sit down to chop veg., have a small pillow in car ( even cinema) etc. Then drugs will do subtle versions: beta blocker bisoprolol had real head over heels spins like falling of a huge cliff; Bendroflumethiazide a rough sea. Strangely I don’t associate the postural hypotension with dizziness, but that might be because I’m used to it, I just feel a drain in energy in the upper arms like a huge magnet coming into play, and I have to sit down immediately ( even lie down on shop floors). Perhaps you should try to get a tilt table test to see what is actually happening to your BP on standing and staying standing for up to 15/20 mins. You could try a NASA lean test at home with a BP monitor, but I know that didn’t pick up my PH , I just thought I’d got POTS. I always find it useful to keep a daily health diary recording symptoms and when what you were doing etc, align with Bp/HR and in my case as diabetic too blood glucose levels ( as that can cause wobbly dizziness). So neck position watching tv, reading, on laptop, or cooking etc, what you have eaten/ drunk, household tasks, exercise etc…you will probably find patterns…useful for yourself to try modifications but also to show drs. Lastly try a very gentle McTimoney trained chiropractor to manipulate your spine, I go every 6-8 weeks, to align and loosen up vertebrae, plus ribs, hips etc. to reduce dizziness!