All Along My Periods Have Been Regularly On A 25-27

All along my periods have been regularly on a 25-27 days cycle, lasting 5 days. However in Feb, my period became lighter and lasted 4 days. In Mar, period came on the 31th day lasting 4 days. In Apr, it came on 29th day lasting 3 days. Recently, it came on the 27th day, started off with brown blood, stopped then with red blood and stopped and started for few days. After my period ended, I had heavy vaginal discharge, from a little thick yellowish to clear watery discharge. I could felt the discharge gushing out as if I'm having my periods.

I felt bloated, nauseous, getting very bad headaches. Also, I noticed that I kept falling sick, color of mucus is yellowish or green but I could recover on my own.

I'm rather worried. Please advise. Thanks.