can drinking 2 bottles of diet pepsi max cause shaking??

Because I just drank 2 and my hands are shaking.

What size were the bottles?

Pepsi max, I believe, contains an added 'stimulant' of some sort? As well as more caffeine (also a stimulant) than the normal Pepsi.

If you aren't used to drinking this much soda, it could definitely cause shaking.

20 OZ.

Yeah, in a short period of time that could cause some shaking (I'm pretty immune to it now, like most stimulants you can become accustomed to caffeine).

The added stimulant-thing in Pepsi Max by the way is Panax Ginseng Extract, so you know, I don't know if there's anough to cause shaking, or.. do.. anything.
I view it as a marketing ploy XD 

Caffeine is a stimulant and if your body isn't used to it it may cause the shakes. Drink some water and lie down or sit for a while. It should go away.

ginseng can build up to a toxic level in the brain.

stay away from that stuff. i think you are sensitive to it.