Thermogenics

Due to lack of funds, I have recently had to purchase some Diet Fuel. At least it was only a $15 mistake. Here are some questions for all y’all. I took two of these fucking things before my leg workout yesterday and had an excruciating headache in the middle of my workout. 5 sets of Squats and 3 sets of static db lunges were all I could get through before I had to take about a five minutes rest. Has anyone experienced such a thing before on this crap? Also can we have some opinions on the best thermogenics? Any votes for Hydroxycut or Ripped Fuel? I bet everyone like MD6 best, right? Thanks all!