Lower Cholesterol Remedies?

I have had a long history of high cholesterol. I have been on simvastatin drugs for over 20 years and my levels are still high. I am up to 80 mg a day for the cholesterol and gemfibrozil for elevated triglycerides over the last few years. My high levels have ranged from 250-320 total cholesterol HDL always around 60. I am in the process of taking myself off these medications as I have found natural stuff that is working and Dr. is baffled. I have not changed my diet or exercise routines but only added two substances to my daily intake. I have lowered my cholesterol to 200 and HDL is still at 60. Tryglycerides are normal. I have taken myself off the tryglycerides meds and will cut my simvastatins in half. My next step is to increase my natural intake of what I believe is taking down my levels without meds. If there is an interest I will publish in a followup adder to this question on what I have added to my diet. However my question is this. Should I stop taking the meds without the Dr. knowledge and continue with my own ysis,until I am certain that these additons to my diet are a direct result of my improved blood results. My last two results show almost identical results.