The negative consequences for me are pretty clear.
Meth makes me a loner and unsociable (because nobody else I know takes drugs I stick clear of them when high)
Meth affects my cognitive skills especially memory but also my ability to write (my job involves a lot of writing)
Meth makes me forget what rthe fuck I am supposed to be doing that day (this can occur multiple days in a row leading to very low professional productivity)
Meth makes me spend a lot of money chasing sex to mix with my meth
Meth has killed all of the veins in both my arms
Meth makes me unnaturally emotional and cry frequently during comedown (this is weird because often no context for crying)
Meth prevents treatment for my psychological / psychiatric problems working properly
Meth makes me immune to meth meaning I use over a gram a day (which is pointless and expensive but probably also physically dangerous)
Meth gives me a feeling of powerlessness because I cannot say no for verfy long (this is bad for my self-esteem)
Besides all of that I think its a wonder drug!
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