" To paraphrase, I might say: "I need to get rid of that tick which is 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, rather then "free" (it doesn't matter https://energyscotlandgrants.mystrikingly.com/blog/solar-energy-grants-uk-government-support-for-greener-homes