Loosing the mantra and coming back to it again and again is a normal aspect of the meditation process. The goal is not to stay on it rigidly, but to gently favor it whenever we notice we’ve drifted away.
It also doesn’t matter how often we lose it or how long we are off, as long as we stick to the method of easily favoring the mantra when we become aware we’ve gone off. So you’re fine there.
However, when picking up the mantra starts to feel difficult, that’s another matter. Strain and discomfort can be seen as “border qualities.” When meditation brings about either of these (or both), we apply the witnessing technique, as described previously. And yes, you’re right — we allow our attention to rest with the sensation (including thoughts and physical sensations). Attention will be drawn wherever it’s naturally drawn, and we simply bow to the natural magnetism of the moment.
Feeling emotional during the day is yet another matter and relates to self-pacing. How we feel outside of practices is the benchmark we use to measure and regulate the intensity of our practices.
The first step is to ensure we have enough rest at the end of our sessions, and to integrate grounding activities — like a daily walk — into our routine. If that’s not enough (i.e., we still feel impaired during the day), we reduce the duration of our practices systematically until we find a stable platform. This might mean cutting back several times. Then we stay there for at least a couple of weeks before gradually increasing timings again — always allowing time for integration at each step.
Self-pacing is one of the most important aspects of the AYP system and our journey toward enlightenment, so it’s crucial to internalize these principles.
Look up “self-pacing” in the AYP lessons, and don’t hesitate to reach out for support if needed.
At this stage, I wouldn’t classify your experience as being oversensitive to mantra meditation. In AYP, that term is used when practitioners need to switch to a milder meditation object (like the breath) because even reducing timings isn’t sufficient to manage the purification effects.
But yes — lots of obstructions are coming out, and yes — things will settle down again. Then perhaps another cycle of loosening up and flushing out will begin… until the system is clear.
That’s why it’s important to understand how to deal with the phase we’re currently in. Sometimes we can push forward, and at other times we need to step back in order to maintain balance — always keeping in mind the flywheel effect and the potential for delayed reactions.
You’re doing great. Keep walking the and enjoy the journey. 
