That's interesting your issue with your tablecloth . . . mine used to be with a pen that if I did not have to write an exam would send me into anxiety . . . I think that we form attachments and perhaps, at least for me, it was an irrational equation of success with the pen rather than with me . . . my friend told me it was like the "blankie" that her daughter had . . . a sense of familiarity, I guess . . . in any case, I eventually got away from my good luck pen by first keeping it but putting it away for longer and longer periods of time; taking it to an exam, but not using it until I lost it one day and I could not find a replacement . . . you know, thinking about this now, I am not even sure that I really lost it or if somehow I just put it away some place never to be found because I did not need it . . .
Perhaps you could try the same technique . . . find a tablecloth that is similar in colour but not quite as a first step and put your old table cloth away . . . eventually go further out of the colour spectrum . . .for example, if your favourite colour is dark blue, start lightening up until the blue is very pale . . . .it may take a long time to do so but you may be like I was and eventually broaden your colour . . . if it is any help to you, a close colleague of mine could not wear anything other than black . . . no reason other than she told me that she just got overly confused in trying to match colours so black was the safest to coordinate . . . she got over it when one day another colleague asked her how long she had been in mourning assuming that someone in her family had passed away :)
In any case, let us know how you are doing . . . take care, KC