I feel you!
I guess the main thing is to be more aware and present in the moment, a lot of times we let the things we do consume us so we lose track of time and forget about other things, even if we started them.
It happens to me a lot lately so that's what inspired me to write this post.
Sometimes multitasking is cool, in my opinion, if the things we are doing are more for fun, today I was reading a magazine and had my coffee in the backyard but when it comes to work, studying etc. I swear by single-tasking.
I hope some of the tips will help you, you can do this!! :)