I have a west-siberian Laika, 3.5 years. A few days ago she's been showing apathy, lack of appetite, fatigue. The vet diagnosed it as food poisoning (possibly she dug sth up and ate it). She's been getting better after two days (both energy and appetite came back), but yesterday, on the fourth day since she fell ill she started behaving really weird. It began when she was sleeping. Suddenly she violently woke up, ran into another room as if she sensed something dangerous, started sniffing the floor and looking at the ceiling and walls. Since that moment, whenever she's inside, after 10-15 minutes of normal, calm behaviour she freaks out like that again, starts running very short distances (2-3 metres), suddenly stops and seems frightened/worried. Sometimes it's as if she's seeing something specific in the air, on the walls or feeling something inside the floor. It makes her very frightened (yesterday evening she literally jumped into my arms when I was sitting in the chair and stayed there for good 10 minutes until I felt to tired to hold her like that - nothing like this ever happened before, she was visibly distressed). She spends a lot of time outside, in our yard, and acts anxious there as well, although not as much as she does inside the house. She keeps sniffing and looking at the foundation of the house, just as she's sniffing the floor when inside.
My question is, seeing as has gone through an illness a day before, could this be a neurological or psychological symptom of anything? Hallucinations or anxiety attacks? I live in Ukraine and we have already called the vet, but he has no idea what is going on, he says it's a normal behaviour but we can see that it's definitely not normal for our dog. We have no money now, also I simply doubt there's a way of testing her brain and neurological system even if we had, not in this country for sure, so there's no way of properly diagnosing her. Please, I'd greatly appreciate any suggestions. There is a chance that she does sense something (we noticed that she's afraid of slowworm, maybe she can feel them waking up under the house), but we have no way of confirming that. Please help, we're very worried!