My dear one,
Sorry for the delay. Rinpoche was only able to check last night regarding your letter, and he said it is better not to have the operation.
It would be good to listen to or recite the sutra Entering the Great City of Vaishali.*
You need to do a puja called che trul. Rinpoche said to request Dagyab Rinpoche, who is based in Germany, to do it.
You should also do this practice: the Mantra of Thirteen Chakras.
[*You can find the audio for this sutra on the MP3 file Recitations for Alleviating Pain. Go to the FPMT Catalogue and scroll down to Audio Materials, then click on “Sadhanas, Prayers and Practices.” To find the PDF file go to "Sutras and Dharanis" in the PDFs and Ebooks section of the FPMT Catalogue.]