Haikus are always very short, but profound. You wrote this one very well. I enjoyed the common-ness of the first two lines with the use of "bitter" and "dying", but I thought the last line was most effective and unpredicted. Surprise endings to something so short often tell the longest stories.
I hope you will continue writing more haikus, since you write them with such clarity and beauty. Do experiment with other poetry forms, such as senryus and tankas. I look forward to reading more!