Can't cum

Mack

So for the past two days I haven't been able to cum, it feels like I'm about to for a second but then it just goes away and I feel like I did meaning, out of breath and being excessively wet the only other time this has happened was when I changed my anti-depressants and that completely cut me off from being able to even be close however I have not have a med change in almost a year. Any ideas on what could be going on?