Does low cholesterol mean clean arteries?

I checked my cholesterol at my local drug store & it was low ,so low that it almost wasnt reading but still,i’ve had breathing problems & heart palpertations ,what does this mean? I changed my diet & exercise regularly by the way. =)
Well the pharmacist said it was fantastic ,so i assume she knew what she was doing but hey ,im starting to feel better ,i just wanna start back enjoying fast food every once and a while without having to worry, thats all =\ lol