I've gotten cranio-sacral therapy (and/or osteopathic manual medicine, which is CST's parent) for decades, and I will say this: there is a wide range of skill and intuition in its practitioners. It is an extremely delicate art/science and it can have profoundly positive effects, but for those of us with issues of blood and fluid flow in and out of the head, it becomes critical to be sure you are seeing someone who can handle your body with exquisite capacity. Not always easy to find!
I have recently started seeing someone very gifted. But even so, there have been ups and downs. The first time I saw him, I was completely symptom-free (all of it--ME, POTS, MCAS, HSD, AAI) for 24 hours after the treatment. It was miraculous. Two days later I had onset of the most horrible headaches in my life. I believe the cerebral spinal fluid levels got unbalanced and pressure built up in my skull. This man took the challenge on and when I saw him for the third time, he relieved 50% of my symptoms for three weeks, which is significant. He told me the other day that as the body learns how to hold these treatments, it is possible to take them deeper, which leads to greater healing.
I don't really expect miracles, and I do know that with systems like ours, even a slight tweak can be upending. But I have found it to be one of the most effective treatments I have had--because I have a great practitioner.
If your dizziness doesn't dissipate, I'd ask the person who did your treatment to fix it @Stacey. Or at least consider that. If you think they are listening to you and your body. I've done that before and it has been successful in terms of righting what went wrong.