Hi... So This Mnth I Had My Period Normal It

Hi... so this mnth I had my period normal it usually last for 5-6 days... but in February didn't get my period...
So the mnth of much I had my period but it seem I get dizzy during class n while I'm lying down bed.. I stop driving because I would get dizzy while driving... my scrubs don't fit me in my waist how it supposed to be so I gain 9lb in 4 weeks...
Female 24 yrs.. thank u