Crawling under the skin could be hook worms, a common parasite in North America. The other possibility is toxocara from horse, cat or dog. There are 3 strains of toxo.
You need to treat mouth, throat and eyes one of the following: 1) Miracle-Mineral-Supplement enema 2) Iodine implants in evening 3) ozone injections into the neck, gums and sinuses (even above the eyes) 4) Rife (a suggest a F165 with SG1 antenna aka magic bean). 5) fefendazole or albendazole. Please note I'm NOT a medical practitioner of any form or education.
You'll need to treat your pets with anti- parasite meds.