Post-vaccine inflammatory syndrome IS a “thing”. So are symptoms similar to “Long Haul COVID-19 Syndrome (LHCS)”.
Give your friend this info ... worth a try.
https://covid19criticalcare.com/covid-19-protocols/i-recover-protocol/
The Long Haul COVID-19 Syndrome (LHCS) is an often debilitating syndrome characterized by a multitude of symptoms such as prolonged malaise, headaches, generalized fatigue, sleep difficulties, smell disorder, decreased appetite, painful joints, dyspnea, chest pain and cognitive dysfunction. The incidence of symptoms after COVID-19 varies from as low as 10% to as high as 80%. LHCS is not only seen after the COVID-19 infection but it is being observed in some people that have received vaccines (likely due to monocyte activation by the spike protein from the vaccine).
Thank you!