Hi Parvati, welcome to the forum.
Can you describe in more detail the awakening you've been working with for a number of years, and what kind of work you've been doing with it?
I received the kundalini-awakening shaktipat initiation nearly eighteen years ago. In the early years following shaktipat, I had numerous physical symptoms similar to what you described - they came and went and I was none the worse for wear. In the lineage into which I was initiated, we are taught that such symptoms, following shaktipat, are called "kriyas": movements of the kundalini energy as it goes about its work of purifying our physical and subtle bodies on every level. I've experienced the vibrations, the heat, the shaking, the visions, the bliss, all of which I accept in a spirit of surrender and gratitude.
I remember one time in particular, when I was on a retreat with my spiritual teacher and a group of fellow students, when I had a shaking kriya that lasted for what seemed like an hour or more - my whole body trembled visibly, even while I walked around and did my seva at the retreat! The entire experience was accompanied by a feeling of peace and subtle, gentle reassurance and love.
I think you will find others on this forum who can relate to your experience, too.
Namaste,
Suryakant