Is it stress, depression or any other.

From long time I face this situation,I explain my problem in 2 modes of period.Mode1-(I can't understand what is going with me,I can't focus,concentrate on anything,feeling nervous anytime,can't take decisions,can't talk e ffectively and smart with any1).Mode2-(in this I can talk very effective with anyone,aisa answer deta Hu k aagewaleka bhi samadhan ho aur Mera bhi,very smart thinking,can tackle any condition,able to talk with anyone with calm mind and thinking).Problem is that.let example- in 1 month 25-28 days I surely live in mode1, 2-4 days in mode 2 in which I want to live.How that modes changes automatically?When I in mode2 I think many times 'yahi thinking aaj dinbhar hone Chahiye'but aisa hota Nahi hai.In that small period I feel very happy from inside.Is it stress,depression or any other thing?whenever I got in mode1 always search on net"how to think effective,talk effectively,about stress,depression,always browsing about meditation"lying on bed anytime, sleepless nights.