Depression in a relationship

So for the past week or so, Ive had an increase of hormones from taking Plan B (not the reason im posting i promise), but its made me extremely depressed. Im in the most loving relationship with my soulmate, but i just cant seem to feel anything for him recently. i know i love him, i know i want to be with him, but its really hard for me to be affectionate and loving because i am so damn depressed. does anyone ever experience this? it terrifies me that i feel like this because he is truly the love of my life. any help would be great. this depression is ruining me.