Me too been drinking diet soda since 2000 and lost about 20 pounds.
Splenda in my coffee every morning. I feel fine.
Splenda began giving me the “squirts” last summer. I was working outdoors in hot weather, and putting “Mio” drops in water for electrolyes. I was sick from drinking the stuff, then got really dehydrated and drank more and more until I had my “AHA” moment and quit drinking it. The problem went away but not for 3 weeks. I didn’t use the stuff for a year, then I found a bottle in my fridge, and used it one day. Near instant cramping.