Just be aware and keep watching the unpleasant feelings. Stay with the emotion and continue knowing.
Yogi: But the feelings are very unpleasant.
Sayadaw: First, you need to have right attitude – that whatever is observed is Dhamma or nature and not personal. Pleasant or unpleasant, object is object. If you want it to be pleasant, that is the problem. If you want the unpleasant feeling to go away, that is also wrong attitude.
If you can watch calmly, then the mind already knows how to practice.
Yogis need to learn how to watch both unpleasant and pleasant feelings with equanimity.