I just had another round ov COVID. No loss of smell. Horrible headache was the main symptom. This would be round 4 or 5. I work in a school.

Go to the link, select the PDF format. At the top of p. 8 they describe their procedure. They are applying it topically, not taking it orally, and sealing it. Doesn't seem to take much at all. Of course, you couldn't seal the inside of your nose, or tongue, so oral preparations might be necessary. Usual dose is 2 mg/kg. Of all the experiments in this study the longest treatment was 8 days. On a more bandage-able wound, I expect horsepaste or sheep drench would work.

Two 8mm diameter full-thickness biopsies were removed from the dorsal skin of adult male BALB/c mice. In the wound on the right side, 30 μL collagen gels containing 10 μM ivermectin or DMSO (control) were pipetted onto the wound and allowed to solidify (Figure 5A). The left side wounds remained untreated and served as additional controls. Both wounds were sealed using Tegaderm, and wound progression was followed over the course of 12 days. We determined that ivermectin partially aided in wound healing as determined by quantification of wound size over time (Figure 5B). At days 8−9 as well as 11−12, ivermectin-treated wounds were significantly smaller than DMSO-treated controls.