Sorty to hear about your brother. Are you talking about the front line doctors Flccc who treat Covid and some like Dr Patterson treat long Covid and vaccine injury?
I’d be weary of the long Covid and injury that seem similar.
Maybe first do the blood tests through a local doctor like looking for elevated cytokines. Things could get very expensive and still not help from what I read.
Ivermectin seems to help some can’t speak for all but like that bike athlete said it only helped if if he took it and think he took black seed oil too. He is getting help but by who I don’t know,