" Put Simply, I'd say: "I need to get rid of that tick that's been biting me all day long." I wouldn't say: "I should be free from that tick." And that is why I might use "rid of" with a cold, as opposed to "free" (it does not matter https://ecograntswales.family.blog/2024/09/13/4-steps-to-apply-for-government-grant-for-solar-panels/