Caffeine deprivation go!

So as part of a biggest loser thing at work that will help me push and actually lose this weight I have given up caffeine and soda in general. While this is good in the long run (I will eventually probably drink some again I know) going cold turkey so to say is starting to get to me. Its even worse while at work and people keep buying soda and I have to ring it out. The other adverse effect is I can't stay up nearly as well as I used to and am passing out a lot from sleepiness.

If I can manage to accomplish 50 pounds in 6 months ill be happy. I am targeting 110 off total is where my happy weight will be for myself. I mainly really wanna lose some pants sizes so I can wear comfy jeans again and not have to shop around at certain places. Well thats all I got right now sleepy and wanna pass out.