Hi Sandy and welcome tho I am sure sorry this is what has brought you here

I know many parents who feel that vaccines have triggered tics in their kids, especially kids who are already susceptible

was one of the vaccines varicella(chicken pox)? this seems to be one that tends to trigger tics, based on anecdotal reports from parents.
Also it seems for some kids the combination of all the shots can have neurological impact

My son has genetic Tourette Syndrome and l-carnitine was very helpful for his vocal tics, while omega 3s are excellent all round (some kids with TS seem to tic more when given fish oil for omega 3 and do better on flaxseed oil)

have you tried epsom salts baths? (2 cups in tub warm water, soak for 20 min) The magnesium sulfate in the salts seems to have both calminative and detoxing properties for kids with tics.

hoping that things stabilize for your son and that this is just a transient tic