Chest Tightness/Pain after Self Aluding Stints

After having four self-alluding stints installed to open three 80% blockages   following a heart attack 4 months ago, I continue to have chest pains/tightness and occasional arm pain. I can not take Nitro. My cholesterol level is at 135, my blood pressure is normal, and my weight is proper. I would like to avoid bypass surgery and I have been reading about EDTA Chelation to remove the plaque. My concern is the interaction with statin, beta blockers, and Plavix(blood thinner)drugs I am taking. I have read that Oral Chelation is only a fraction of the effectiveness of IV chelation and that it is a synthetic amino acid. What concerns should I have related to any use of EDTA and are you aware of any clinical trials that are underway in the southeast?

Are there ANY other means of removing plaque naturally from arteries without surgery?