I was on my period for 22 days...4 days off... Now I've been on it for 5 days

Okay I was on my period for 22 days in a row (light to medium flow) and I was worried because it was the LONGEST I've ever been on my period, I wanted to go to the walk-in clinic and many of my friends encouraged me too go but my mom told me not to worry because when she was on her period it was very irregular and she though it's just trying to regulate itself out (I'm 20 by the way) and because I was off of my period for about a month and a half my mom thought it was basically "emptying itself because I was off for awhile" BUT I ONCE missed my period for about 4 months when I was like 16 or 17? (No I am not sexual active) and when I had gotten my period back after that 4 month wait it was only 6 days (like normal) 

So anyways, my period left me for about 4 days no spotting or anything (if there was a lil spotting it was very light) And I was super happy because I thought my period was finally over then it came back on day 5 and every since then it has been medium flow (I have to wear a pad) 

I'm honestly so worried and I have no idea what to think... Has this happened to anyone out there? Or should I really need to go to the clinic. Thanks guys 💕