I’ve been diagnosed with MDD. It’s been 2 years and 6 months since I got depressed. I’ve tried many meds but none of them helped. In the first year of my depression, I have felt 0 happiness. 

Then, I started several meds and noticed euphoric (is this even a correct term?) feelings for several minutes to half an hour - like I was full of happiness, smiling, laughing, happy crying, it’s like I saw my happy future passing in front of my eyes. 

I had this euphoric feelings approximately 7 times, 4 of them while on meds and 3 of them while off meds (for at least a month). 

I’ve never felt happiness before I was 15 (now I’m 19), I wasn’t suffering but I wasn’t happy either. It could have been dysthymia but there’s no way to be sure. 

I’ve been very irritable and aggressive from time to time (anger issues) all my life. 

Before starting meds, I’ve been having mental breakdowns 4-5 times a day, also tried suicide twice. After meds, I stopped crying (I rarely do). 

I’ve always been a lazy person, but after getting depressed I stopped functioning whatsoever. Sometimes (1-4 times a month, if my depression is milder), I get motivated enough (out of nowhere) to do homework and all, other than that - I’m useless. 

I know that Internet can not diagnose me, but could this be bipolar? 

My main confusion stems from what manic episode actually is. Does it last for months? For minutes? How often should you have it to be considered a bipolar?