Are you a full-time student with a full course load? Do you have a part-time job in addition to this? If so, I tend to agree with Sky that maybe you should cut back so you can concentrate better.
I am about to finish my MA this semester, and I've been a wimp all along, only taking one or two courses at a time, along with my full-time teaching job...all I could handle! But that's me, at age 57. I know younger students who work and take full loads of courses, and I don't know how they do it!!!!
Love
Patty