Is the vet sure it was a stroke? Tilted head, wobbly and flicking eyes sounds very like Vestibular Disorder, sometimes called Old Dog Vestibular Disorder. Do have a read up and see if that seems to fit, because if it does, there’s a good chance that with rest, quiet and tlc he could make a good recovery.
My dog is 15.5 and a large breed. He started having vestibular episodes exactly as you describe last year. Each time it took a couple of weeks, but he recovered. His bloods have all been normal as well.
He hasn’t had a vestibular episode since last October, although has recently started having some other issues, which seem to be neurological, but he’s happy, enjoying his food and enrichment toys, loving his walks and being spoiled rotten by the family and the vet is happy he has a good quality of life. Obviously we monitor him very closely and he sees the vet every 4 weeks but, for now, he’s doing ok.
My other dog did have a stroke, caused by a combination of his illness and the meds he was on and while there were similarities in terms of wobbliness and an initial head tilt, his eyes didn’t flick, one of them turned and the third eyelid became stuck over it. He was a very poorly dog already at the time, but still recovered enough to enjoy a quiet month at home lying in the sun and being spoiled, before we lost him to his underlying condition.
With my boy’s vestibular episodes, we found it helped him to have a pillow to rest his chin on to sleep, as lying on his side made it worse. One of us would sit with him so he could lie propped against us and rest his chin on the pillow and then he could get a decent sleep and we found the more rest/sleep he got the more he improved. That said, they do need to get up and move about, as their brain has to learn to compensate for the imbalance.
I do hope he recovers, but it sounds like he’s a very lucky boy to have had a long, happy life with you and he will know how loved he is. 