According to the search results, Suki Panesar is a character in the British soap opera EastEnders who has been experiencing a mystery illness. The exact cause of her illness has not been revealed yet, but there have been some clues and speculations. Here are some details from the search results:

• Suki has collapsed in one episode, and her friend Eve was by her side to help her.
• Sukis GP suggested that she may be suffering from stress and offered to prescribe her some medication, which she refused.
• Suki has been experiencing some alarming symptoms, including disorientation and hair loss.
• Sukis husband Nish has physically assaulted her in a disturbing scene.
• Some viewers have speculated that Suki may be faking her illness, as she has a history of faking cancer in the show.

In summary, the exact cause of Sukis illness in EastEnders has not been revealed yet, but it seems to be related to her mental and emotional state. There have been some clues and speculations, but the storyline is still ongoing.