Sometimes, I don't know why but I just want to cry

I don't know why I have to write, but I do; as if writing would make me feel a whole lot better. In the past week or so, every night that I am at home I just get these mild headaches. With these headaches is the feeling of nausea. I don't have the motivation to do anything. The body is sluggish and the mind does not want to think. Thinking just makes the headaches worse. Usually, I just curl up on the couch in a foetal position and channel surf through all the programs in an end-less loop. None of which , I wanted to watch. For no reason at all, I have a strong feeling of wanting to cry but I don't, as if crying would make me feel any better. I go to uni to get my assignments done because I know there will be days ahead that I will get nothing done and I know that if I stay at home I'll end up on the couch in a foetal position channel-surfing through all the programs in an endless loop. None of which I wanted to watch. And for no reason at all, I will get this strong desire to cry, but I don't; as if crying would make me feel any better.