Have you tried specifically cleaning your 6th chakra extensions along with the 6th chakra and the 7th chakra? That could help.
Not really but I think I did put more effort into cleaning and empower these as I know the weakness of a chakra can cause issues in that area.
Anyways, I don't have this issue anymore, GB20 and LU7 was pretty effective. I think headstand also helped. It could also be that the Gods helped as one day I was pushing GB20 and the pain completely went away (but normally I still felt a sort of tension, and I know the pain would go back if I stop pushing it) and I don't have it regularly now.
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Also, for my other post here about having nasal mucus, I realized that it is because of eye water, as the eye has a tube that goes to the nose and excess tear goes down that tube. But recently I was putting more effort into my hearth chakra also and it seems like that also help. I think the Gods helped me in both and with my tailbone also.