Is my seasonal affective disorder/ depression starting again?

[Leyha]

HI everyone! This is my first post so go easy haha. For the past 3 to 4 years I have suffered with depression and anxiety, especially over the winter period. Due to this I've been on 20mg citalopram for about a year with no trouble. However, over the past 2  weeks I've experienced nightmares  (something I only get with an incorrect dose of anti depressants ), feeling numb and tired, unsociable and around 10 days ago I self harmed while drunk , something I haven't felt the need to do since January. Its also worth mentioning im 19 years old. In your opinions do you think I should go see a gp to try increase my dosage, or wait and see if I feel any better. Sorry for the long winded paragraph - thanks.