I'm no expert but suggest you put 'What is soya lecithin?'
in the search box of your browser. There are many references. As one might expect it is an extract from soya beans. Lecithin is also reported to be a naturally occurring substance found in beef, eggs and other foods, but why the soya source should be any different is not clear. I can't help wondering if there is some other reason for your problem and would suggest you seek professional advice.
Best wishes.