My wife tested positive 10 days ago. She experienced some rather common symptoms: Mild fever, cough, and so on. But on day 5 she lost her sense of smell/taste and around that time she also got this strange sensation in the head.

She is having a hard time describing how it feels, but it is very unpleasant. It's not a headache as such. She describes it as the feeling of electricity going through her brain. Painkillers make no difference. Caffeine/coffee makes no difference (maybe a bit for the worse). Warm baths make no difference. Walks and fresh air make no difference.
She sleeps well and is able to chat, laugh,s and perform daily tasks without showing any lack of coordination or competence. But she complains that the feeling in the head is constant, She says that it's much worse than having a headache.
Have anyone experienced something similar? Any recommendations for remedies to try?