I know a good place to feed especially if your're blood-starved, go to the dawnstar sanctuary if you've already completed the dark brotherhood quests, wait until around 2 am then sneak over to Dawnstar and look for legief's house, pick the lock go in and sneak up to him and "activate" him you will be given the option to feed or pickpocket, choose feed. This hopefully will help you solve issues you have been having. Best of luck.