" Put simply, I would say: "I need to get rid of that tick which is been biting me all day." I would not say: "I need to be free from that tick." And that is why I might use "rid of" with a cold, as an alternative to "free" https://energygrantsuk.health.blog/2024/09/13/what-you-must-know-before-applying-for-eco-grants/