It's fairly common to experience this after heavy abuse of MDMA (and some other serotonergic drugs like tramadol, SSRIs). They're often referred to as brain zaps.

https://psychonautwiki.org/wiki/Brain_zaps

You should really take a long, long break from using MDMA now, dude. You can't abuse it like you would abuse speed. It'll start to become a huge problem in terms of unstable mood and cognitive decline very quickly. Plus you'll totally ruin the magic of the drug and do untold neurotoxic damage to yourself. You're probably already aware of the dangers, but just in case:

https://rollsafe.org/page/how-often-can-you-take-mdma-molly-ecstasy-and-roll/