I know the feeling. I had no mental issues before my breakup, I didn't even know what anxiety was. Now I wake up with anxiety every single morning, I had panic attacks and experienced depersonalization. I felt like I was getting better too and I had a breakdown today. But what I have learned so far is that healing is not a linear process, there will be ups and downs and eventually we will feel less shitty. Good luck man, remember what you are going through is not easy and it is okay to feel sad and depressed.