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Interesting about his request for a shot. Some background that Claude assembled (and this human greatly edited, merged, condensed and reorganized!)...

Per the TV broadcast, Busch had been struggling with a sinus cold that was exacerbated by the intense G-forces and elevation changes at The Glen. The "shot" he requested from the team doctor was consistent with treatment for sinus/cold symptoms — likely a corticosteroid or decongestant injection, which is a common approach for athletes dealing with sinus congestion under physical stress. In his final days, Busch was said to be suffering a cough and was thought to have had a sinus cold. A sinus infection can, in rare cases, lead to serious complications (such as spreading to nearby structures).
His phrasing — "he's the kindred doctor guy" and "he'll know what I need" — suggests an established, ongoing treatment relationship rather than a one-off sick visit. Athletes often have a go-to doctor who administers these regularly, which would explain the familiarity in his radio call. There are common injectable treatments for sinus issues in athletes:
Corticosteroid injection (most likely) — A shot of something like methylprednisolone (a "Medrol shot") or dexamethasone is extremely common in professional sports for sinus congestion, inflammation, and pressure. It reduces swelling rapidly.
Toradol (ketorolac) — An injectable anti-inflammatory/painkiller widely used in NASCAR and other pro sports. Drivers sometimes use it for pain and inflammation broadly — not just sinus issues — and it's so common in racing that teams often have a designated doctor who administers it pre- or post-race.
Antibiotic injection — If the infection was bacterial and oral antibiotics weren't cutting it, an injectable antibiotic (like ceftriaxone) could be used for faster effect.
NASCAR, drivers operate under extreme physical conditions — sustained G-forces, heat, vibration, noise. Sinus congestion under those conditions is genuinely debilitating (you can't equalize pressure, your head pounds). It's not unusual at all for a top-tier driver to have a regular sports medicine physician who knows their medical history, their preferred treatments, and what works for them.
The "kindred doctor guy" phrasing likely just means their longtime personal team doctor. The fact that he was seeking an injection — and that this doctor apparently knew his case well enough to have a standing protocol — could suggest a more chronic or recurring condition rather than a simple one-time cold.
Watkins Glen has a 115 foot elevation change. You usually don't feel your ears popping until you go up or down 500-600 feet. But maybe there's a cumulative effect of many rapid 115 foot elevation changes? Obviously, with his helmet on and driving, he couldn't equalize pressure. Besides elevation changes, lots of other factors could affect sinuses:
G-forces — The lateral and braking forces at The Glen are intense, repeatedly shifting fluids in the head and sinuses lap after lap
Vibration — The constant vibration of a race car at speed can agitate inflamed sinus tissue
Heat — Cockpit temps can exceed 130°F, causing dehydration and thickening mucus
Helmet pressure — A tight-fitting helmet can compress already-inflamed sinus areas
Think about The Glen. A driver experiences that 115 foot elevation cycle 90 times, with each lap taking about 1.5–2 minutes. That's not like driving over a hill once; it's a repeated, rhythmic pressure change hammering inflamed sinuses over the course of nearly 3 hours. If you had a sinus infection and someone pushed on your cheek 90 times, even gentle pressure becomes excruciating through repetition and cumulative inflammation.
The physics that make it worse than a casual drive:
Speed amplifies the pressure differential — at 100+ mph, airflow dynamics and buffeting around the helmet and car create external pressure changes that compound the elevation effect
G-forces redistribute fluid — every corner, braking zone, and crest shifts the fluid in your sinuses in ways a normal drive never would. At The Glen specifically, the Esses (turns 2-3-4) are taken in rapid succession, creating a rapid left-right-left fluid shift
No relief — in a car on the road, you instinctively slow down when you feel bad. A race driver can't. He has to maintain full commitment lap after lap
Closed environment — helmet and HANS device restrict any natural head movement that might relieve pressure
Duration — nearly 3 hours of this, with no real break
Whether the sinus illness was related to his death is not known. What started as an apparent sinus cold may have escalated into something described as a "severe illness," but without an official cause of death, any connection is purely speculative.