LenTe, I think this video may be helpful to you: https://vimeo.com/108926780
Also, this article: https://www.conquerchiari.org/subs%20only/Articles%20%2714/lack-of-dural-opening-can-cause-symptom-recurrence.html
Once you get the results of your new MRI, you will know more and hopefully have some answers for your symptoms. The hard fact is if the decompression is still holding, your CSF flow is restores and you have no significant syrinx their work is done.
One of the reasons that several medical advisors have been brought into this site the and the educational/informational materials taken down and submitted for a best practice review is because there seems to be the perception that surgical treatment does more than it really does. Fewer than 20% of all Chiaris are ever surgical. Of those only 70% is surgery succesful. Success BTW meaning your don't have severe adverse events or get worse. I'm not discouraging treatment by any means, but the reality is out of 100 chiarians fewer than 7 are ever "fixed" by surgery (or multiple surgeries)
The numbers on the internet or on a forum such as this tend to skew the perception of whats going on. Just as the success rates of various doctors can be mis pericieved. Most NS are very selective in the patients they choose for surgery usually for ethical reasons, but not always.
The perception of surgical treatment being a magical fix all for headaches and other symptoms is not a problem just here but also some "Chiari Specialty" Clinics and advocacy groups and certainly throughout the internet. I don't believe it to be intentional.
The fact is restriction of CSF can cause most "Chiari" symptoms. Its unintentional I'm sure and based on "hope" BUT it is not the only cause and many times the chiari is in fact incidental to something else causing those symptoms.
Concrete evidence that once you have Chiari, you always have it does not exist. Once it is repaired, its repaired. All too frequently the repair needs repaired but that is a horse of a different color. None the less the official stance for surgery, is that it is to restores normal CSP flow and to prevent possible damage from a syrinx.
Hopefully your new studies will provide more and new answers, but you need to consider the fact that if your chiari is repaired and it is still repaired, they can't fix something that isn't broke.
As you can tell, everyone's story is different. I believe you have to make the best decision you can for yourself a this moment in your life and take it one step at a time. I have had to have two surgeries. Each have helped me. I don't regret either. Because at each of those points in time I was experiencing symptoms that I could not tolerate anymore. Make sure you make this decision with a good surgeon and when you feel you will not tolerate living like this anymore.
However, brain surgery does not come without costs. I experienced intractable migraines for years after my surgeries. I did not know that was what was going on and it took me years to find the solution. I see an amazing Neurologist who gives me Botox injections quarterly for migraines and they are completely under control. More recently, I started experiencing new problems in my throat and mouth and am working through that now with the help of a wonderful cranial sacral therapist to stretch the tissues around the head and brain as a result of scar tissue. And this is about 10 years post surgery. So it is a process. But, I never stop looking for answers. It is your life, you need to make the best decision for you. Unfortunately, they are not always easy decisions. I hope this gives you one more perspective. Good luck to you.