LU- No you can not be arrested for Libel.
As to whether Health can be sued by Clinton for libel? She can sue him, but first she has to find him. Proving her case will be hard because as soon as she does every conservative organization will file, a friend of court brief. Everything from Whitewater through Benghazi will be on the table. Health can claim it all depends as to what criminal is (means) and as a Public Figure the bar is higher to prove libel. Does she want all her family scandals revisited. Even if she wins it will cost her millions in legal expenses and she probably wouldn’t collect a dollar. Some of you may think Health is a doctor with a lucrative practice but I doubt it, although I think he makes a good living. She may win the case and the court can award her only 1 dollar. Health also can declare bankruptcy and never pay just like OJ. So the chances of health having to pay is minimal, although he will probably be famous.
Please Note: I am not an Attorney and you should not use this as legal advice but consult and attorney in your state.