I see a pattern when ever I'm in stress my periods are effected badly, this happened during my jee(IIT preparation)where I got periods for 15 days I was given a 3 mnth course then it was fine but after 4 yrs when I was preparing for my interviews in my btech this problem again started.... doctor suggested me to take thyroid test and scanning ,  thyroid level was at edge and scanning report was normal so she again gave me a 3 mnth course things went normal After this I'm doing thyroid test for every 6 mnth to ensure that it is normal , but  after 2 years recently when I was preparing for my interviews again I'm having irregular periods so what to do to avoid this irregularity??? I'm doing yoga and taking proper  diet too but still this period problem seems like it doesn't go away What do you think must be the problem ?? Do I have to go for any further tests ?