Med/surg is very tough for a new nurse! The best thing to do is develop a good "brains" system. I made sheets on my computer at home, then made copies and brought them to work. On the front, I included report info, head-to-toe assessment, etc. On the back, I had it organized by hours of the day, and I would write in what needed to be done for a pt. (So then for each pt, I would have a full plan for the day.) Then when an order was completed or the med was given, I would check it off. (Otherwise, I would never be able to remember what I did/didn't do.)
Throughout the day, new things come up that you can't anticipate, but I would always have my original brains that I could go back to, which helped me get back on track. And when the new orders came in, I would just insert them onto my masterplan, and check them off when they were done.
Honestly, it will become easier the longer you do it. You will become more familiar with things and you'll be able to anticipate things better, making you more efficient. Plus, with experience you'll be also to zero in on what's important, and what is less of a priority. That all will come with time. Just try to stick it out for now.