I used to drink Monster energy drinks and the biggest can would last me for hours and I would be pumped. After awhile they stopped working and I switched to Red Bull and got even bigger energy boost than I did with Monster. Now when I drink a Red Bull or two it still doesn’t work. Why aren’t they working anymore for me? Is there ANYTHING else out there that will work for me?

It is called tolerance the same as idea as alcohol tolerance. If you drink often it takes more and more to get the energy. Be careful because the more you drink the deeper the hole. Eventually if you consume too much caffeine you will overdose. Wean yourself off the energy drinks slowly. If you cut it off cold turkey you can go through some serious withdraw. Believe me I know.