In over my head?

I am having such a bad time with school right now. I am so busy with work(three people have quit),home and all the other stuff that I am forgetting everything. I forgot to attend seminar for this class last week and then I forgot to submit my assignment for A&P last night and I got a 0!!! I am so angry with myself. I have carried a 4.0 average all 3 terms until now. I could understand if my grades slipped because the work was difficult but not because I simlpy forgot!! This is not like me at all! It isnt a time issue, it just seems that my mind has so much in it right now it cant seem to remember important things!!