Advice on going forward

So I started taking sertraline over a month ago and for a bit things were really improving. I felt level headed in a way I haven't felt in a long time, I found it easier to get up and go to work in the mornings (and I start at 6am so its hard to be motivated that early) and I was overall feeling really positive. Lately though I have been feeling more like my old self, hysterically bursting into tears regularly every day, feeling alone, worthless, the usual kind of things.. I've taken my medication everyday but I don't know if its effecting me anymore. my downward spiral seemed to start once I realised how little my doctor cared about my mental health during a follow up appointment, it was literally a 2 minute conversation and then she said goodbye and moved on to the next patient. having what I thought was a really strong support has been knocked out from under me and I don't really see the point in continuing my medication any more, despite multiple warnings from friends/family that I should stay on them. I guess I'm really just looking for some advice or support from anyone who has felt similarly or has had a similar experience..