Obsession with a girl makes me want to stay in bed forever

I'm obsessed with this colleague at work that I think is dating another colleague. I just can't stop thinking about her. I'm really trying to improve myself working out and taking minoxidil to fix my hair but this wave of depression keeps coming everyday. I don't even feel like masturbating because I start thinking of her with this other guy.

I haven't touched a girl in so long that this always happens. I meet a girl that seems happy talking to me and I go crazy over her. I just feel if I keep going like this I will never improve and die alone.