Ok, if you have only been working since October then I really think you need to give it time. There is always something to be done and not enough time no matter what floor or population you work with. Unfortunately it is the nature of the beast. At 2 months in you have so much growth in front of you, but it is often hard to see it at the point you are now in your nursing career. Your preceptor thinks you are doing great, try to focus on that and give it a year. Keep a journal and write down something after every shift about what you learned, a positive comment from a patient or co-worker or something that you improved up or struggle with. In a few months read back and I bet you will be amazed at how much you have learned. Where you are now is normal and I would be worried if you felt you hand a great handle on your job right now. Hang in there.
I felt the same way for much of the first year or two! It did get better, much better! I wish I had some time management tips for you but that is still my area of struggle 6 years in.