I think if you got your liver working better some of these issues might go away.
Read Moritz's Liver Flush book and pay careful attention to the heart-liver illustrations.
Detoxing while your liver is backed up can give you the exact symptoms you are describing - not to rule out anything pathological - best go to the experts if you think there is something serious with your heart, it's not something to take lightly.
One little known problem with lecithin, and I can't remember if this was brought up by Reams or Jensen or god knows which of the hundreds of books floating in my head, is that it can so aggressively clean the arterial system and literally dislodge chunks of plaque into circulation creating a heart hazard. Obviously it doesn't happen to everyone but it's good to file that away just in case.
I would try to stay away from vegetable oils for a period of time to see what happens.