Sweetener dilemma? Splenda or Stevia?

I wish I could use Stevia in place of Splenda. I tried stevia for a week and I became VERY dizzy and disoriented. I remember walking down the street and I had to grab my husband because I was going to faint. After looking up the side effects of the stevia, I was pretty sure I was having a reaction to it. I tried it again a few weeks later just to be sure and the same thing happened. I don't seem to have any reaction to Splenda other than a bit of bloating if I use too much. I do wish I could give up the sweeteners all together but I have guilt issues when I resort to sugar or high calorie alternatives. It is a work in progress.