It's been nearly a year since your post (sorry, I've got the dates wrong by looking at the date you've joined), and I'm sure you would have encountered more experiences by now.
You might want to know what will happen to these insights that you have already experienced with contnuing practice and also without continuing practice.
I will share this information that I have gathered and experienced from a similar condition. Based upon your description,
if I may allow to give an opinion, I am inclined to think that you could have developed an insight level equivalent to 'udayabbaya nana' or the fourth stage if we were to classify the vipassana insights into 16.
Udayabbaya nana is the insight into formations/becomings and dissolutions/ceasations of mind and matter by direct experience and realization when someone is practising vipassana meditation and has already achieved samadhi or one-pointedness concentration. Here, one will surely develop 'upek kilesa' or hinderances to progress further. They are altogether ten in number, one of which fits with the description you have made, which is 'piti' or rapture, extreme satisfaction, clamness and peace. Again, there are five varieties of piti, but I am not going to elaborate them.
They are regarded as hinderances to progress as they tend to capture the yogi/meditator and bound the person to this level of insight until and unless the person knows how to overcome this barrier. These hinderances can also occur when someone is practising samatha or transcendental meditation and has achieved strong samatha.
What will happen with continuing practice?
You may either stuck to this level if you do not have right guidiance OR
proceed into next stage 'bangha nana' which is one of the higher insights in vipassana practice. I will not elaborate on this insight at this moment as it could influence your progress in a negative aspect if you know the theory and will expect the experience.
What will happen if you stop practising meditation?
Vipassana meditation is unlike samatha meditation where one can fall from a higher level to zero. It is like a technique or a skill that you have developed which will never go away but may become less skillful if you are out of practice. For insctance if you have learned how to ride a bicycle or to swim, you will never forget these skills but may be less efficient without continuing practice.
What will happen if you have stopped practising vipassana and have already reached the insight of 'udayabbaya nana?'
If you have reached this insight level through vipassana meditation and for some reason could not practise further, you could be free of a rebirth into four unpleasant states; viz. as an animal, as a 'peta' or unpleasant spiritual existence that includes ghosts, demons, gnomes, etc., as an 'asura' or fallen angel roughly, and as a hell being, PROVIDED you have realized the three characteristics of nature viz. suffering (dukkha), impermanence (anicca), and impersonal (anatta) through learning, and realization with vipassana meditation.
Will you forget in your next life what you have learnt and have developed the skill in this life?
The answer is NO; as the parami or the fulfillment that you have developed will help you to practice vipassana somehow in your next life if you born as a human again.
If you born as a deva or an angel/god in heavens you will come into touch with vipassana in four different ways (sota nugatta sutta). I can elaborate into this subject if anyone is interested but would not do so for the time being.
best wishes into your practice!