I know your question was whether others have had this experience but I thought the following might be helpful. I can imagine that this must be worrying for you.
Have you checked the patient information leaflet to see whether hair loss is a known side effect of Sinemet?
If it is not, it may be an idea to call and speak to one of our nurses to see what they can offer at 0808 800 0303
They may be able to help you pinpoint the cause.
If you do continue to feel that it is related to the Sinemet , you can report this side effect to the yellow card scheme. You can find out more about this here: http://yellowcard.mhra.gov.uk/the-yellow-card-scheme/
In the meantime, as polly mentioned, this issue has been raised on the forum before and you can find previous conversations about hair loss here: http://bit.ly/Ia69UN
I hope this helps.