" To paraphrase, I would say: "I would like to eliminate that tick which is been biting me all day long." I would not say: "I have to be free from that tick." And that's why I'd personally use "rid of" with a chilly, rather then "free" (it doesn't matter https://greenhomesgrant.blogspot.com/2024/08/what-are-steps-to-apply-for-free.html