What happens when after a good week you have a bad day

I have to say that since I've started taking an antidepressant (prescribed by the psychiatrist) and it started having effect, I've been feeling better. I've been sleeping better and I don't feel like there's only darkness around me. I'm starting to see the light at the end of the tunnel and I'm pretty sure I know now what I need to do (how I'm going to do it I'm still trying to figure it out) to reach there.  

Even though I'm feeling better I still have bad days or bad moments. I still have moments when I start to cry. When little things make me cry. Things people say, things people do, conversations about certain topics that people have when I'm around. They don't have to stop talking about it I know. I'm the one that has to work this out and I'm really trying but I'm not made of stone. I still have feelings and I still let some things get to me. I'm still hurt and my heart is still broken so it's easy that some things will still hurt me and make me cry. 

When this bad day comes I feel like I'm not getting better. I feel like I'm taking a step back instead of taking a step forward. On these days I feel like the darkness is covering the light at the end of the tunnel. But, thankfully, it's only one or two days in seven. It's not seven days as it used to be. So I think that's a step forward. And I need to accept the fact that I'm still sad, that I'm still heartbroken, that I'm still suffering from everything that has happened. I need to accept all of this and not fight against it. And I think I'm starting to do it. I don't feel as desperate as I used to. Most of the days I don't feel desperate at all. 

I hope to continue on this path and I'm doing/going to do everything that I can to stay on it. Even with the bad days in between. They're just part of my life and I need to accept them as I accept the good ones.