You are probably aware but I gotta say it man...Using such a large amount on a daily basis is were you are going horribly wrong, my friend!
Meth should enhance focus and increase productivity if used properly. Focus based tasks are perfect for proper meth use. I used to double my work production on meth days and you could look at my reports and easily see which days I was high. Without meth it wasnt physically possible to do, literally.
You have certainly depleted you dopamine, so the positive effects that a person would usually experience are simply not a possibility for you. The fact that you become disorganized, lack focus, and struggle with writing are textbook examples of your dopamine depletion. Basically, as you continue using more meth, you are causing your brain to become tolerant to the massive influx of artificial dopamine, therefore causing your brain to cease its natural production. When you stop using meth it will take your brain much longer to turn back on its natural production, leaving you, for a period of time with no dopamine!! I hate to say it but that time is going to suck fat asshole, without a doubt. You will not be able to feel good and will face a rather sever depression....the good news is it wont last forever and your brain will reboot production as long as you dont use any meth at all. NONE. During the reboot period.
I strongly suggest you consider a break. It will only get worse and you are missing out on the good high anyway! I know it will suck but you can do it and you can find tons of support here on BL! Please, really think about it?
Lastly, if you make the right choice
and take a break, be aware of the depression that will happen. It important to realize that your thoughts and feelings are not valid during this period! It helps to ignore the absurd thoughts that will come.
Pm me if you ever want to talk! I got some helpful tips