I Had A Full Physical In May 2013. My Cholesterol

I had a full physical in May 2013. My cholesterol was 170 in May 2013. In March of 2015 it was 230 and this week Nivember 2015 it was 252. I am 46 years old and am 5'3 and weigh 113 lbs. I eat almost no sugars and no carbohydrates and mainly eat fresh vegetables and lean meats. I also eat some fruits as in apples and occasionally strawberries but that's rare! I've eaten this way for nearly 5 years trying to be healthy. Why is my cholesterol climbing so high and so fast and what can I do about it naturally? My hemoglobin A1c was also a little high? I drink after iced tea with lemon and I do use a lot of Splenda. That is really my only source of sugar or sugar substitute!