Fainting or blackouts - Syncope vs TIA

Faint and blackout for my Mum about 6pm heading out to restaurant on the way to dinner. Not a blood sugar hypo. Blood sugar was 7+. Only lasted a few seconds. Fell on tarmac cut head. M&G there as well as Dad to help up first aid etc. Does not remember falling / being helped up -  blackout. hospital... CT scan, blood pressure checks etc. Nothing obvious. Home about 2:30am.

Sounds like a stroke?

But fainting or syncope with a blackout can be simply due to low blood pressure temporarily not enough blood/oxygen supplied to brain sounds like what happened. They can present with memory loss.

Syncope https://www.healthinaging.org/a-z-topic/fainting-syncope/causes  "caused by a temporary decrease of blood flow to your brain" 

"In older adults, the most common causes of syncope are": 

1.  "orthostatic hypotension[sudden drop in blood pressure], 

2. reflex syncope["usually a side effect of cartoid sinus syndrome" "pressure sensors in one of the carotid arteries in your neck are hypersensitive"],

3. heart disease."

Other causes can be 

4. Brain or nervous system conditions 

5. Dehydration

6. Medications

Or Stroke/TIA ? https://www.mayoclinic.org/diseases-conditions/transient-ischemic-attack/symptoms-causes/syc-20355679 if it was mini stroke you might also be noticing non-blackout FaceArmsSpeechT symptoms sometimes.  https://www.nhs.uk/conditions/transient-ischaemic-attack-tia/

More similar info:

https://www.heartrhythmalliance.org/stars/ie/blackouts-checklist

https://www.emedicinehealth.com/fainting/article_em.htm

Simple things like standing up too quickly, turning neck, emptying bladder, postprandial syncope can be the immediate cause. 

Myself and Kate have some experience of fainting as a teenager(get up, no breakfast(for mass), cycle up steep hill, don altar boy outfit kneel/stand/etc for a while//Kate Crohn's and similar exertions - standing on Luas). No faints recently for me but maybe close to fainting on rare occasion, maybe 5 years ago last time over-exertion unloading theatre container and getting the hot and bothered queasy feeling so out and lie down in cold to rest and get rid of it. Sometimes light-headed/purple shiny flare if relaxing on couch at home and stand up suddenly and start doing something.

Another relative is in and out of hospital alot over last month and a bit more. Parkinsons affecting nervous system severely now and the control of blood pressure is affected. If he stood up and started moving his heart did not start beating faster to keep blood pressure up so he ?fainted? and fell quite a bit before getting used to that. Exhausted all drug/other options to help this now. So now he is not mobile using his legs any more. Wheelchair needed.