I found this thread through a search engine and thought I'd add my experience.
I used very high doses of Kratom extracts almost every weekend for a year without developing a habit. Then, I switched to daily use maybe three months ago as a way to combat depression. I can totally identify with OP's symptoms. Kratom sucked the motivation and joy out of my life and made me impossibly lazy. Worse yet, it altered my personality... My outlook became very dark and my relationships with several coworkers and friends went south. I kept getting the strange, almost alien desire to quit my job, move to another country and cut ties with everybody I know. To die without dying, basically.
I tried kicking cold turkey a couple of weeks ago, but caved after two weeks of withdrawal. What did me in was the lack of sleep; while the anxiety and sickness wore off after three or four days, I slept a total of maybe 12 hours in 14 days and started losing my mind and fucking up at work. I got scripts for Xanax and Ambien, but neither one knocked me out for more than 2 hours, which might be a consequence of my having fucked up my GABA system through years and years of alcohol abuse. (Phenibut worked but is not something I'd use more than once a week after having withdrawn from Phenibut...)
So, here I am again, taking 10-15 grams every afternoon. Right now, I'm grateful for the sleep: never in my life has sleep been so regular, restful or easy. However, I know the depression is going to kick in soon and just hope the negative psychological effects don't ruin my life before I'm in a better situation to kick. Next time I am definitely going to taper... what other tricks helped?