Missing Period

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Hello! Im missing a period and I just want to know who else has had this problem. Im not pregnant and the last time I even had sex was back in late March or early April but wore a condom. Last time as you can see in June 2 I started my last period. Im currently in South Korea and I’m having issues like acne, more hair than what I was used to fall off and hair breakage. I went to the clinic and they did a pregnancy test and of course negative. I’ve had cramping sometimes and that feeling like I’m about to start but it just never does. I’m also having sleeping issues. Before I go back to the clinic so they can see what’s going on, I just want to see if anyone else has this issue and so I can be ready if it’s something really bad. I’m 20 btw.