Sometimes the best way to get motivated is just to start whatever you need to do. I have motivational problems studying for class. The hardest part for me is just to START. Once I get over the mental block of needing to start, doing whatever study I need to do comes easier. However I would break down the things you need to do into segments and write short term goals of what you'd like to accomplish by the end of the day. Taking 10-15 minute breaks every hour can help you stay motivated too.

The headache is probably not going to go away until your mum visits. Are you suppressing thoughts of her and what she will do? Sometimes if you try to suppress the stress of what you see is coming, there will be a rebound effect and you'll think of it even more.

For instance, lately I actually realized that I'm not invincible. The thoughts give me a lot of anxiety and I've had wonky physical symptoms. At first I tried to suppress the thoughts, but it caused my anxiety to go up. Instead, I started to let the thought come into me and flow out of me. I still think about it randomly throughout the day and I still get some anxiety, but its become less as I give that thought less power and accept it for what it is.

....I'll write a little more later. Brain Fart.