Hi, I don't know if this will help you at all but this is how I try to gain a little control.

Sleep - When I start to get less sleep I move onto decaf and do nothing but try to read for the last half hour before i go to bed. So no internet or mates round or fast paced tv shows. I try to go to bed around the same time every night if possible to create some routine and regular sleep hours. Sleep is so important for me.

Caffeine intake - I control this when I'm on the higher side of life by moving to decaf after 6pm.

Shopping - I let my friends check my ebay account for example and delete what is not needed. Have post it notes by my computer to slow down my erratic spending online (its so easy).

Big decisions - Never ever ever make big decisions when feeling high or low, leave it until stable.

These do not stop the effects of my Bipolar but they do help