" Put Simply, I'd say: "I want to get rid of that tick which is been biting me all day long." I wouldn't say: "I must be free from that tick." And that is why I'd use "rid of" with a cold, as an alternative to "free" (it doesn't matter https://greenhomesgrant2023.blogspot.com/2024/09/why-should-you-apply-for-free-boiler.html