I'm not sure what your diagnosis is but if u bipolar then u born with it n usually don't know u have it until all the Seratonin (happy chemical) in your body has been used up. U then have a chemical imbalance (burn out) n that's.when they can pick it up. It's very difficult to diagnose straight off. U can learn to live around it n reach a point where u can tell your triggers n take care to minimise their effect. It takes hard work but it's very rewarding. Every time it's different, depending what's triggered the down. Can be a minute or so or cud be days. U hang in there sweetie. Here if u need to chat. Big hugs as can be very frightening of I don't know what's happening

It can be for a short time mine 20 years.

I'm experiencing it rt.now. I was initially diagnosed w.major depression ,bef.bipolar disorder,over 30 yrs ago. I managed to have some stability for abt 20 yrs,..but it's always been there. Sometimes lasting for minutes, other times, hours, days, to months. I learned that most of d times, there are triggers to it. Medication, therapy/counseling,and having a good support system help.

Unfortunately I am pretty much depressed all the time, but I do have times when I'm feeling pretty good, then I'll feel that familiar feeling of depression coming on for no apparent reason. The feeling is sometimes temporary. A few minutes or hours, but more often then not it will last days at a time. One psychiatrist said it's possible that I have non-treatable depression. Which basically means that medication will help to relieve the symptoms a bit, but they'll never go away entirely. Which sounds pretty hopeless, but accurate.