OHH Dear,,,I can see the frustration going on with you these days.
Now coming to your problems which i think some of them really needed to be reviewed and others are just creating problems for you out os anxiety
1:now excessive hair growth
and pigmentation in female should be further investigated.I would have asked you to tell me about your menstrual history aswel but anyways you need to see a dermatologist
,to do some blood tests to check whether your hormones are ok and if he thinks then he ask for an u/ scan for cystic ovaries.Ovarian cystic disease can produce such problems.
2:Some of the issues are i think due to the course of Isotretenoin therapy you are on. It should have been explained to you that the skin can get really dry,sensitive and fragile while on isotretenoin so you must avoid threading,waxing or anything traumatic to your skin during the treatment and few months after finishing with it to avoid scarring.Its important.
3:I dont know y have you eliminated dairy products from your diet???????????
4:I think the dark circles
really dont need any medications,,,if you are having a balanced diet,good night sleep,lots of water and avoid stress(which you are having at the moment) then everything will be fine.
5:last but not the least,none of your problem is life threatening or which can not be sorted,so take it easy and enjoy your life. yOU ARE JUST 23 YEARS OLD AND ACTING LIKE 73:) I MEAN TAKE ABOVE MENTIONED ADVISES AND EVERYTHING WILL BE OK.I think you just need to see a qualified Dermatologist ok.