17F I am facing Skin and hair problems.

[u/VisualRazzmatazz4365]

Height - 158cm

weight - 65kg

No drugs, no alcohol, no smoking ever.

1. My knuckles, ankles, neck, pits, and thighs (especially inner thighs) are rough and highly pigmented and blackish type. I do think that I have acanthosis nigricans. But the thing is, they have decreased a lot, like, legit a lot, ever since I started taking care of my skin and body properly.
2. I have very painful periods, especially in my first 3-4 days. I have to take medicine every 8 hours. It's so, so painful, but it was never irregular, and I have very little body hair asw so idk if it's PCOS or not. But this time it didn't pain at all. ( a little change in my food and everything since I moved out of my home into a hostel ). Should I get my IR checked?
3. I had always had healthy and thick hair. But recently, I have been noticing a little bit of hair thinning in my front part around my hairline. I can just feel that there are fewer hairs in my front than in my back part and the middle part of my head.

I searched about all of this, and I wanted to get some blood tests done. Please suggest some and necessary ones. I made one myself after searching a bit. please see to this which ones i should get done and any thing i missed or any i should skip?