I think it's normal to lose interest in school easily when there are impacting events that can affect you. It's also hard to know what we "have" to do in society when it comes to a job. So if you feel like you don't really FEEL what your doing, I would suggest actually following through with the things you would RATHER do.Education is always there. Time isn't. I find time to be very precious and a part of being human is the ability to be able to express ourselves while feeling the happiness and joy of life THROUGH doing theses things like going to the beach. They bring us closer to Earth, closer to ourselves. For some, like myself, the best way for me to get back into the school thing, was to take a much needed break to do the things that my heart REALLY desired; with no money wasted, only memories and positivity and experience gained. You also had an impacting thing happen to you, which I am very sorry to hear, and that can be very draining on you even if you don't notice when your trying to study. I would suggest taking some time for yourself to do the things you truly love, make the most of your time, and you'll soon feel alive again, rejuvenated, and MOTIVATED. All we need is a little LOVE in our lives to realize the things we really want to do with life. Do the things you love, and then the things you desire with come into your life, including the motivation to do what you want; in time.
I hope this helped.