I have a problem with concentration and brain fog - when will it pass and how to deal with it?

If you have tested positive for COVID-19, it is advisable to contact your GP. He will suggest treatment appropriate to the severity and type of symptoms, and may also recommend additional precautions - for example, monitoring saturation with a pulse oximeter. At the same time, it is important that you remain under the care of an internist in the event of an exacerbation. Fever, headaches, weakness are quite typical symptoms, which are usually remedied by using standard drugs for this type of ailment: https://www.gdziepolek.pl/kategorie/leki-na-covid-19 In the case of high fever (above 38.5 degrees Celsius), drugs can be given that will reduce it containing paracetamol (eg Apap, Panadol), ibuprofen (eg Ibuprom, Ibum) or naproxen (eg Naxii, Aleve). Cognitive impairment is a possible complication of COVID-19, but from your post it is difficult for me to clearly deduce whether you observed these ailments now, when the virus attacked you, or whether there were problems with concentration (you are already taking drugs to support brain function): https://www.gdziepolek.pl/blog/co-po-covid-19-powiklania Complication therapy after COVID-19 is still developing dynamically, as we learn how the virus acts on the body. However, it is impossible to answer when the "brain fog" will pass in your individual case. In some COVID-19 patients, it persists for up to several months, and there are reports that some individual symptoms may last even longer. The key is to remain under the care of a neurologist, you can possibly try supplementation on your own, for example: https://www.gdziepolek.pl/produkty/112632/aurotyna-po-przebyciu-covid-19-kapsulki/apteki