Just answered someone else asking about PCOS and the surgery so I will just copy and paste what I wrote to them.
I am just coming up on 10 months post op and have lost about 73lbs. I've dealt with PCOS, Endometriosis, Adenomyosis, Insulin Resistance, Migraines, etc. all my life.
10 years ago I was put on Metformin to help with those issues. Especially my PCOS, IR and it worked wonders for those things (and made my migraines disappear too). The Metformin kept me regular all those years, lessened my periods in days and volume, helped my cramps, etc.
However, since getting the surgery I had my Metformin cut in half and I "think" I may be taken off of it all together eventually. But I have to say that since my dose was cut in half my periods have been heavier, come late/sporadically, stay super long (last one lasted 12 days), etc. REGARDLESS of the surgery. So, I don't know that surgery helped ME with those issues. But it has helped with my high BP and I am almost off of that medication too.
I never dealt with acanthosis nigricans so I can't offer any info on that.