(CNN)Actress Jamie-Lynn Sigler says she's "overwhelmed" by the reaction to her revelation in the current issue of People magazine that she has multiple sclerosis. "I don't feel so alone," she tweeted Wednesday, thanking fans for their support. Sigler, 34, told People that she was diagnosed with the debilitating disease when she was 20 but didn't want to reveal that she had it until now. Sigler said she decided to let her fans in on her struggle now, just days after marrying Cutter Dykstra, with whom she has a 2-year-old son.