I have similar bouts of depression and I can go up to a week feeling down with random bits of crying in between, it frustrates the crud out of me...
Something I do (instead of impulse buying... which I kind of did tonight... beautiful red/white butterfly that I decided to give to the fiance for his birthday) is carry a small stuffed animal around with me... sound's odd I know, seeing as I'm 22 lol but it does help.
I also just like to go window shopping or just walking around (candy helps sometimes too)
If you really think a second fish would help, go for it, but make sure that you really have a connection with him/her before you buy or else you just wind up kinda "meh" about the whole thing, which may or may not worsen the situation.
Also, if you have a special tea or drink that you enjoy and really happy kind of disney-like movies, a nice way to calm down is just sitting there for a few hours sipping on hot tea and enjoying the movie (my favorite teas are jasmine and camomile)
Hope you feel better soon!!! <3
Carrying a stuffed animal around? How fun! I may have to try that. Anything that makes me randomly smile (like a sweet text message from my Mom, seeing my fish do something cute, seeing a stuffed animal in my backpack whenever I reach to get a pencil
, etc) usually helps my depression.
I also enjoy hot drinks to calm down (ice cream is my favorite comfort food, though! Yogurt is great, too). And things that remind me of my childhood (like Disney movies).
When I was younger, I would carry around a notebook that was only for doodling. Whenever I felt overwhelmed or worried, I would pull out a pen and start drawing.
Can't think of any of my other "depression remedies" right now... I should get a light, too. They have small ones for desks on Amazon. My mom has one that she uses and we call it "Happy Light"!