03/03/2011 at 03:00 AM EST
Serena Williams was recently treated for a frightening pulmonary embolism
, but the tennis ace is home now and says she's "doing better."
Still, she says, it's been a tough week. After the embolism, she had also sought emergency treatment for a hematoma on Monday.
"Thank you everyone for all of your prayers, concerns, and support," the star, 29, tells PEOPLE in a statement. "This has been extremely hard, scary, and disappointing. I am doing better, I'm at home now and working with my doctors to keep everything under control."
Williams also says it will be a while before she's entirely healthy again.
"I know I will be okay, but am praying and hoping this will all be behind me soon," she said. "While I can't make any promises now on my return [to tennis], I hope to be back by early summer. That said, my main goal is to make sure I get there safely."
Her rep also says in a statement, "Thankfully everything was caught in time. With continued doctor visits to monitor her situation, she is recuperating at home under strict medical supervision."
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