The beauty of Theravada is that when we stumble on the path, we can always pick ourselves back up and start again in this moment - mindfulness. There are 4 types of mindfulness (satipatthana):
1. on the body
2. on the feelings
3. on the mind
4. on the true nature of things.
It is best to start with #1 - specifically with breath awareness. This may also be the most beneficial way to dissolve lung.
- seek a secluded, quiet space
- sit down, quiet the mind.
- cross your legs
- keep your body erect
- bring your attention to your breath as it naturally moves in and out the nostrils. Note the sensation at the tip of the nostrils as the breath moves in and out.
Then, inhale slowly and deeply, filling first the lower abdomen, then the middle abdomen, then the lungs - gently until the collar bones rise slightly. Hold the breath there for a count of 5, then gently, slowly, release the breath in the opposite order - first the lungs, then the middle abdomen, then the lower abdomen.
Pause, and repeat the process, - 5 times (beginner), 10 times (intermediate) and 20 times (when 10 times is comfortable).. Never strain. If you have feelings of light-headness, return the attention to normal breathing - observing the sensations at the tip of the nostrils.
When finished, sit and observe the quieting effect on the mind.
Once this practice is learned and applied as a regular practice, a solid foundation is prepared to developing the other three types of mindfulness. Once all 4 types of mindfulness practices have been learned and applied, we can move on to deeper awareness practices.
Best of luck in your continued recovery.