Thomas Markle just told us he's back in the hospital after experiencing serious chest pains and doctors are performing a battery of tests on him. He says the doctors told him his heart was "seriously damaged" after his heart attack a week ago.

Thomas tells TMZ Meghan tried calling him Monday but he was not near his phone. She followed up with a text telling him she loved him and was concerned about his health. He says she harbors no ill feelings toward him for making a deal with a paparazzi agency to stage photos of him getting ready for the wedding.

As for the Queen being upset with him, Thomas scoffed, saying, "I don't think the Queen is thinking about what I'm doing."

Thomas says he's thought about it and now believes what he did with the photos was not a serious transgression, although he calls it "stupid." He says he now wants to make the trek to England, telling us, "I hate the idea of missing one of the greatest moments in history and walking my daughter down the aisle."

Thomas says if doctors let him out of the hospital he will risk his health and fly to England so he can be with his daughter. Whether he gets released this week is problematic. Thomas says he's lobbied the doctors, asking if he can get out Wednesday, but they have been noncommittal.

As for his eldest daughter, Samantha, talking to the press, Thomas echoed the sentiment our Meghan Markle sources have sounded, saying Samantha has had no real relationship with Meghan as an adult and has no knowledge of Meghan's relationship with Prince Harry.

Bottom line, he says, "Of course I'd walk her down the aisle. This is a historic moment. I'd like to be a part of history."