Anxiety after leaving work!

[NursePie]

I am a new nurse with about 5 months experience. When I am at work I double and triple check everything I do. Every pill, injection, patch is checked over and over to make sure that it is the right dose, place etc. However when I leave work and come home I get a horrible feeling like I forgot something or that I gave the wrong thing. I check everything I do and I know I am giving the right med but I always question myself. Example: I give 4 units of insulin. I know I took the blood sugar. I know how many units to give. I check the bottle, the order, the name on the bottle before and after it is drawn up. Yet at the end of the shift I will go through the entire book and make sure everything is signed out and that the right amount of coverage was given. Sometimes I leave work and have to call back to make sure I but the right nitro patch on someone or to make sure I plugged the feeding back in. I KNOW that I did because I checked it and signed it but I still go home doubting myself. I am having major anxiety over this. I don't sleep well, I don't enjoy my life. I don't know if it the place I work. It is long term care and there are over 20 patients. The most is 32. I can't do 32 patients. I will be a reck. Could it be that I am the type of nurse that is better with less patients? What can I do to stop this? Any help is appreciated.