" Basically, I'd Say: "I would like to get rid of that tick that is been biting me all day." I would not say: "I have to be free from that tick." And that's why I would use "rid of" with a cold, instead of "free" (regardless of no matter https://www.evernote.com/shard/s722/sh/7c602f28-76af-5c18-30c7-a48464763389/7GDLDMhiDKBF5Sv11yXg3k3rYNW2q3tjSfB4gFUvmPRfI33Mad8-fJPUOQ