Nacho, I don't know what is happening in your mind/body. Not specifically. I can offer my guesses, but that is not important nor relevant.
You know that Master Lin says that as healing begins, ones conditions can sometimes intensify. It seems to me, that while in Master Lin's presence and receiving his energetic aid you were aware of this happening. It not something totally unexpected. Also you sense of emotional tidal wave as you left, appear to me to be the same sort of thing.
In fact, have read your post over some time now (although I can be wrong, because I haven't been specifically tracking you), it seems to me that your emotional and belief blockages are more important.
A few other thoughts that have roamed through my mind while reading this thread are some recommendations for you and everyone. Namely, reviewing the basic information in the level I and II course. In this case, a review of the six sources of blockages might be valuable.
Another idea, was that ones progress in something like SFQ is not measure by time. It would seem to me that as you advance in SFQ and in developing more balance and flow in your life, your beliefs and attitudes will change and bring you greater comfort and joy. My experience with resistance to my own development is that following Master Lin advice and staying with the system and Trusting in the universal energy is the best path. It is not I who causing the balance and flow it is my opening and releasing that allows balance and flow to occur in and around me.
You mention that you seem to experience what you interpret as good things during meditation but they quickly fade after you leave meditation. I recommendation, is that as you start your meditation isto ask your master(s) to have these good things be part of your entire life. Then, I think it is important for you to not go looking for their absence. Just trust that they will appear in your life as it most appropriate for your path. As you give over to trust and gratitude you will notice more and more how balance and flow are entering into your life in a supportive manner.
Nacho, you are perfection,
Iam2 