has my depression returned?!?!?!?!

ok basically i had depression from 10 - 14 litrally it was going on mi bday cause i had fallen inlove with my gf anyways its been gone the past 9-10 (bdays in april) anyways my gf totaly pulled me out of being deppressed and im still totaly inlove with her although latly i have been feeling down but the whole time iv been on low energy like all the time regardless of what i eat or exercises i do my life style hasnt changed nor my general day to day things evrythings been the same but anyways last night i fell asleep early like 5-6 and was asleep till 12 and i couldnt get back to sleep untill 5 which is to be expected but while i was awake i was messed up, litrally iv been growing my hair because i have an almost phobia of getting it cut because my dad cut it when i was young like propper loads and iv been growing it the past year and then i got a familiar feeling to cut myself and i dono why i did not that deep just through the skin the scars from when i last did it had disapeared and i kept getting the feeling to cut my hair, like it was no longer me, i would talk to my girlfriend about it but its valentines day and i dont want to ruin it, i dont know what to do i didnt tell my mum last time i had it because my sister is messed up to she cuts herself but she isnt depressed she has their weird demons living in her head but she's getting help atm which is good i dono if they could be related if that helps anyways, if it is back ill have to tell both my mum and gf because i dont like hiding things but im scared of what to say ect but regardless do you think i have depression again also its not just been lasnight when i got the feeling to do it its been before aswell not quite as bad but iv also noticed other sighns of it coming back but not very strong the occatinal =/ day ect but not this thanks for reading