Hi Ryodo, and welcome!
Clearly you have a sensitivity to meditation, which means your nervous system is sensitive and purifies itself quickly with very little transcendence in stillness.
I can't comment much on the approaches you have tried over the years, but can offer a few tips from the AYP point of view. First, if symptoms of purification are excessive and uncomfortable, we "self-pace" (reduce the duration of) any practices we are doing that are causing the discomfort. It is not uncommon for sensitive meditators to reduce their meditation time to a few minutes twice each day for some time, and engage in more grounding activity in the daily routine to achieve the right balance (exercise, social activity, service, etc.). And if no meditation practice is best for a time, then so be it. Nothing to be ashamed of. A high level of spiritual sensitivity is actually a gift. You only need to find ways to let it unfold naturally while improving the quality of your everyday life. That is the true measure of any spiritual practice: Is daily life getting better? If so, the practice is good. If not, better make adjustments.
A few more basic things from the AYP approach that can help:
1. Always rest after meditation (relax with eyes closed, doing nothing) -- 5-10 minutes at least, and more if you are sensitive. Lying down is good during rest time if convenient to do so. If sleep comes, that is fine. The rest period allows purification and opening cultivated during meditation to finish unwinding, rather than carrying it out into daily activity where it can lead to restlessness and irritability.
2. After rest and getting up, it is best to follow the meditation session with healthy activity -- physical or mental, which will help ground (integrate) inner silence and the associated energies in the nervous system.
3. Do not meditate (or do any other spiritual practices) near bed time. It is preferable to do afternoon practices before the evening meal, with healthy ordinary activity between dinner and bed time. This can reduce energy disturbances during the night. "Night practices" are discouraged in AYP. We all need our sleep. This is especially important for those who are sensitive to meditation and prone to disruption of sleep, as you have been.
There are additional things in the AYP lessons that can help with sensitivity and kundalini issues. You are probably already familiar with
Lesson 69 on measures for kundalini excesses, but you may not yet have seen
Lessons 365-367 on the range of sensitivities to meditation -- especially
Lesson 367, which offers suggestions on optional approaches to meditation, including using a longer mantra (which slows down transcending to stillness), or using breath as object in meditation instead of mantra (which limits transcending to stillness). Either of these may or may not work, depending on the person. It is a process of discovery for each of us, finding a balance in practices that suits our nature.
You are not alone in this. Spiritual sensitivity is on the rise around the world, and many are having to deal with the rapid inner unfoldment that comes with it. If you check around the forums, you will find many such cases where self-pacing, grounding, and alternate approaches to practice are being explored and implemented. A lot of "real time" help is available here, where the experience-base is constantly growing and evolving with practitioners at all levels of experience contributing.
Others who have had similar issues are encouraged offer their comments in this topic also. Please do!
Wishing you all the best on your continuing path. It is going to be all right.
The guru is in you.
PS: If your insomnia persists, you may wish to utilize a mild sleep medication for a time (with a doctor's advice, if needed) to help get things back in balance. Some good sleep can go a long way toward clarifying our perspective on spiritual practices, and on life in general. No need to be obsessive in these things. As we have found, and often remind practitioners when purification is accelerating -- Less can be more in spiritual practices, and in life. Letting go is sometimes the best practice. Bhakti (spiritual desire) will always be there, and that alone assures our unfoldment in due course.