This may or may not be related to the vitamin E supplements. Stop supplementing just in case. To rule this out, you can try supplementing again later on to see if you develop the same symptoms.
I only took 400 IU of vitamin E for one day. I got diarrhea, and severe fatigue. It´s been 2 days.
The Vitamin E overdose effect occurs when more than 1,000mg of Vitamin E is taken per day. Acute vitamin E toxicity effects include nausea, gastric distress, abdominal cramps, diarrhea, headache, fatigue, easy bruising and bleeding, inhibition of platelet aggregation, diplopia, muscle weakness, and creatinuria.
According to the American Association of Poison Control Centers' National Poison Data System, in 2008, more than 60,000 acute or chronic vitamin overdoses were documented, with 8 major adverse outcomes and 0 deaths.