This is just my experience, but might ring true for a few others. For years, I existed with massive headaches, I couldn't put my head below my body in case my brain exploded. My brain was foggy. palpitations, fatigue, dizziness, joint pain, stomach problems, glucose spikes,lethargy, pigmentation, bleeding under the skin..... the list was endless. I was tested for thyroid, adrenals, hormones, rheumatoid, lupus. Can't even remember them all. They all came back negative - but I just knew that I was dying.
One day, I received a forwarded e-mail about aspartame, and the health problems it caused, and I went through the list of conditions it mimicked, and ticked most of the boxes. That was the last day I touched aspartame (knowingly) and I've not looked back since.
From the day we were diagnosed, we were advised to drink "diet" drinks. Which I did religiously. Little did I realise that the aspartame was poisoning me. I accidentally ingested the sweetner on 2 occasions, and within minutes, I was left with the crippling headaches that I used to have - and I now have no idea how I coped with them on a daily basis!