sounds like kundalini pushing through the brahma granthi, the knot at the base of the spine
it will do what it does and the less you fight it the better. I would suggest getting some good books on kundalini and reading up so you have a framework for some of the experiences that might happen to you. i liked "Kundalini the Energy of the Depths" by Silburn, Lilian although it is written from the point of view of Kashmir Shaivism. That being said there really isn't much Buddhist literature, and Kashmir Shaivism is a wonderful nondual philosophy at that which i highly encourage you to explore in your kundalini studies.
I would avoid an online forum called AYP (aypsite.org) which gives free kundalini counselling. I have seen a lot of complaints about them and their so-called advice.
I would practice the microcosmic orbit, and agree with neem that spring forest is awesome qigong. Keeping your tongue against the palette of your mouth (the roof) as much as you can is something i often see advised.
You can look into shaking practice too, to loosen the energy in the knots and blockages up and stimulate energetic breakthroughs.
have fun with it, the discomfort passes