What kind of hair loss is this?

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I first noticed this back in february, when I had gotten a haircut, that my hair had generally looked a lot more thinned out. Ever since then, it seems to just have graudually thinned out even more for seemingly no explanation. My hairline itself has more or less been the same since I was about 20, its just the overall density of the hair itself that seems to be fading away, and at an alarmingly fast rate. It happens gradually but when the hair loss does happen, it seems to happen almost suddenly. Like one day theirs hair there, the next day their isn't. I've looked for any sort of variation of hairs from around me scalp ("miniaturization" I guess what people here are calling it) but all pretty much look the same. Even the the back and sides of my head look like swiss cheese when its wet. Albeit, not as bad as the top, but still present. when my hair is properly groomed, I'm sure its one of those things that nobody notices but me, but I feel like if I lose anymore, it is going to become noticeable. I went to the doctor, she told me to take some supplements and get some blood work done so I did about a week ago.

I've posted some pictures where I messed up my hair to exhibit the extend of the damage. If anyway has an idea what this might, be the help would be much appreciated, thanks!