Oops, only just saw this thread.
Had my stroke late October last year.
I couldn't walk for the first couple days and when I finally did under supervision I near fell down the hospital stairs due to dizziness. Slept pretty much all day after that.
I asked doctors and nurses the same question as you did. And got the same answer each time. Nobody knows. It affects everyone differently and timescales for recovery are anywhere between a week to forever.
I'd highly recommend the after stroke exercise classes offered. These last if I remember correctly, 8 weeks and are 1 hour sessions staffed in my experience by friendly pretty nurses

The exercises are pretty gentle to the average Joe but left me absolutely shattered, but did go some way to recovery. Keep in touch with the local stroke team also. They're invaluable and full of good advice.
Please ensure that you have someone at home looking after you if the dizziness is a real problem. Despite me assuring her I was ok, my daughter unfortunately witnessed me losing my balance after struggling to make a coffee, then crashing into the kitchen table knocking stuff everywhere and landing head first into the kitchen door. That friggin hurt!
I didn't have a turbo at the time so left the cycling for a while and took increasingly long walks with the mutt to build up my stamina.
I think it was February/March when I took the bike out and started tagging along with a council run social ride group. There's likely something similar in your area as councils around the country are obligated to offer ways of keeping their population healthy.
The rides are mostly off road on cycle tracks/lanes around 10 miles long averaging 8 or 9 mph and usually have a cafe stop mid ride. No one gets left behind. I add a few miles by cycling to and from the start point.
My dizziness has improved alot as has the wretched fatigue but even now I'll still crash out on the couch post ride and sleep a couple hours. I'm still pretty wobbly though and struggle to keep the bike in a straight line especially going uphil.
One upside to the stroke and I've heard the same from other stroke/heart attack victims is that your outlook on life changes. Enjoy life now. Never mind working every hour you're given in some vain attempt to set yourself up for a comfy retirement. That retirement could very well be taken from you any day. Don't put anything off.
I hope you recover very soon
