Weird rumination, can this be a glutamate imbalance?

I've been diagnosed with ocd and adhd about an year back. The thing is, my ocd is mainly rumination based. It's like my brain doesn't register a thought.

I tried lexapro 30mg, fluvoxamine, both didn't do shit. Generic brand of ritalin OD 18mg helps a lot with this, but only for 4 hours. The 10mg instant one helps me for 2ish hours. Brand name isn't available in my country

So for example, a normal brain after getting a hot coffee when they're craving it would feel good and say to themselves how they really needed it.

for me, as soon as i start to get that exiciting or happy feeling, i start rumination upon tangents that my brain sends me to. It is extremely weird and hard to explain.

Let's say i study for 4 hours successfully. As soon as i start to feel proud or happy, i start obsessing over the fact that this is a desire, and buddha said desire is bad. Now my brain starts to prove as to why that is completely bullshit, but my brain doesn't register those arguments no matter how much logical they are.

I DON'T EVEN BELIEVE IN BUDDISHM. I know it is purely irrational, but my brain starts to disprove it and doesn't get the satisfaction and therefore gets hooked on it to get any form of temporary relief. Now the anxiety caused by that depletes my motivation levels and i end up in my bed calling it a day, even if my to do list is only half done.

It happens a lot normally and especially a lot when i'm excited or happy in general. Would this rumination count in the ADHD rumination or OCD rumination?

This is absolutely screwing with my day to day life, it's like my brain doesn't register my thoughts at all. What would be the best supplements for this? Is this a glutamate imbalance or is this a dopamine imbalance in my brain? I have a big exam upcoming and this thing is wrecking me.