Still can't find the flow

I'm doing a course at the moment. This course is vital to fulfill the terms of my current five year plan. It involves a career change from general, office based, administrator and dogsbody to freelance IT and English tutor. I've already got a TEFL qualification and am doing a certain amount of teaching. However, I've never expected to be able to make a living teaching English in Ireland. Hence this course which will qualify me to teach IT skills, FETAC, ECDL, etc. There is a lot of work involved and up until Christmas I was doing OK, getting assignments done, meeting deadlines, etc. Since the Christmas break I've been unable to concentrate. My work on assignments has slipped to the extent that I've handed nothing in for the last two months. I've spent most of this evening in front of the computer trying to put together an answer to a question which should have taken me approximately half an hour. It's still not finished and what I've written is disjointed and full of un-backed-up assumptions. I've also got a headache! The urgency I felt about embarking on this course of study has dissipated completely. I still badly want to do what I've planned but what felt well within my grasp six months ago now seems like a insurmountable mountain that I'm ill-equipped to climb. When will I get back my sense of purpose or at least the ability to knuckle down and do what's necessary despite the distractions all around me?