Talk to Gynecologist on Periods Issue

Assalam o alaikum, I want to discuss something. I am 22 years old, and this is the second month that I haven't had my periods. I'm sharing this because it might be related to what I'll discuss with you next.Since last month, I've been experiencing severe pain in my legs, extreme fatigue, and I don't feel like doing anything. I often feel nauseous, and sometimes I actually vomit. My mood swings have become intense; I start fighting with everyone all the time. Even the smallest things are affecting me deeply. I told my mom, but no one seems to understand what's happening to me. I find myself crying out of nowhere without knowing why. I feel like running away somewhere far, and strange thoughts keep coming to my mind. What's that issue ? I'm feeling so angry, irritated, and frustrated with everything.