I have the same thing. It used to be so bad I would feel it while walking 24/7. After a parasite cleanse months ago I got rid of it but I still feel it sometimes. It is a tickling feeling as you said, like pins and needles for neuropathy except it's not numb it just tickles. I have felt it all over my stomach not just belly button; I think it could be a parasite of some sorts but we can't be 100% sure.