Hello!
The head tilt and the 'eye flicking' (Known as nystagmus) and vomiting are can be symptoms of a stroke. Alternatively, she might have something called 'Vestibular syndrome'
Your dog seems to be displaying signs of mild ataxia (loss of balance and proprioception). This is most likely due to a mild case of vestibular syndrome - a condition affecting the vestibulocochlear nerve in the middle ear or brain. It usually resolves by itself, but can require treatment if the underlying cause is, for example, an ear infection.
Is he displaying any of these signs: head tilting to one side, nystagmus (pupil flicking from side to side like when a person is looking out the window of a fast moving train), falling over, tending to circle to one side?
If the ataxia is witnessed during the veterinary consultation, your vet may suggest doing a blood test. Either way, a full neurological examination, including all the reflexes and the cranial nerves, would be very useful for ruling out certain things.
If it is a stroke, although some dogs can recover from a stroke - in the case of Lucky who already has many problems it may be kinder to think of her quality of life. My advice would be to take her to your vets for them to confirm what they feel the problem is. It is so hard when your dog becomes old and they are no longer able to walk, stand and they generally are no longer enjoying life to the full. In many ways it is a priviledge that we can put them to sleep so that they are at peace. It may well be that this is the kindest decision to make for her - as hard as i know it is. The vet will be able to advice you and take you through options to help Lucky.
Do contact your vet as soon as possible as an emergency as Lucky will be feeling very disorientated/sick (A little like our 'sea sickness') if this is a stroke that she has suffered.
Please let me know how you get on.
Clcik here for reduced pet meds.