I think Byza has given you some really good advice. Well are allowed to feel the blues from time to time, but if it is affecting your life, you should seek help. Try rule out any physical issues first e.g. lack of energy/sleep, vitamin deficiency...

I didn't think I needed to see a psychologist, but eventually went, on a friend's recommendation. It's taken me a good while to realise that underneath everything, there were a few things I needed to sort out in my head. It takes time