We avoided the hospital for those reasons.

Here is Sarah:
Dr Katz protocol for long covid.Twice a day
tributyrate 600mg -1800mg with food. 30 mins later
Nicotinic acid i.e. Vitamin B3, the kind that makes you flush. 250mg - 3g. Work up to 3g. The flush can be intense the first time. Raise the butyrate to lessen it.
Methyl B complex 1a day or every other day as high does of one B cancuase deficiency in others.
Vitamin C
Also, if you feel you need it, selenium and taurine, with the butyrate.
My hair stopped falling out 2 days after I started high doses of niacin. Was 500-2000 lost a day before.
People are recovering within 3 months on this protocol