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One of the first congressman infected with the novel coronavirus says it hit him “like a ton of bricks” — with the “tricky bug” constantly returning whenever he thinks he is recovering.

Florida Rep. Mario Diaz-Balart, who announced his infection Wednesday along with fellow representative Ben McAdams, said his sickness started with an “absolutely splitting headache” Saturday night.

“Luckily I have not had an issue breathing so I’ve never had a scary moment,” he told his older brother, NBC anchor Jose Diaz-Balart.

“But obviously very very unpleasant with headaches, with coughing and with intense fever all coming at the same time, it seems.”

Although he started Saturday’s interview with his brother saying he was feeling better, he conceded it might not stay that way.

“It’s a tricky bug because just when I thought I was over it — or I was pretty close to getting over it — the fever will come back,” he told NBC.

“But … not as bad as it was originally, and I think hopefully the worst is passed.”

Sen. Rand Paul on Sunday became the first US senator to test positive for the virus.