I looked up Clonidine, and what receptors and it binds too. I think it's safe to say combining it with pregabalin is resulting in the effects i described earlier when combined with other meds like Benzodiazepines and Baclofen, and in that case i think you are right about what you experience.
I was on Pregabalin for 6 years, but I quit because it case braindamage, I was experience well know and proven side effects like forgetting words multiple times a day. Long term usage of pregabalin can result in Alzheimer, just like benzodiapines can. Your also on the max dosage used when a doctor would prescribed this medicijnen, 600 MG a day is only given to people to battle pain case by nerf damage or epilepsy, the ma, dosage for anxiolytic effects is 450 MG a day. People should not compare its effects to benzodiapines as this drug only makes you feel high during the first days after that it should fade away making the med do it's job without intervering to much with your cognitive functions like benzodiapines do. This is the reason I quit the drug completely and I believe this drug shouldn't be prescribed for longer than maybe 2 years. Long term damage resulting in Alzheimer and memory impairment is also well studied in Benzodiazepines especially when taken on a daily base and the dosage. My advice would be to quit this stuff.
I was able to quit within a week, and at day 1 I dropped from 3x 450mg a day to one dosage of 150 mg 2 hours before bedtime. The withdrawal effects aren't as bad as some people claim, 150 before bedtime is plenty to be able to sleep, after 4 days I dropped to 75 MG before bedtime and I quit after a week.
I'd also like to share that I'm not against chemical meds, but the Lion's mane mushroom studies shower significant effects in cognitieve improvement and binds to a brought spectrum of receptors, a lot of superfood claims are bullshit simply as a business model.. good news this isn't the case with Lion's mane, studies showed its very effective in combating the damage caused by Benzodiazepines, Gabapentinoids, and similar substances. It's also easy to grow with a kit, the fresh mushroom can be fried and than stored in the freezer, and it's best taken with your breakfast (omelet or whatever) and before drinking coffee.
I'm very tired and my writing ATM is a bit all over the place apologies for that (Im Dutch). Feel free to ask me anything. I can only say my life improved since I quit taking antidepressants, pregabalin occasional lorazepam and introduced Lion's mane, which btw also has positive anxiolytic effects