Oh my god I'm going through the exact same thing right now. I've been feeling good for a full month now and I was so excited today because this was the longest stretch that i have had in almost two years. And then as I'm leaving for work, Three different cars almost crash into me out of plain stupidity, then I can't remember what I needed from the grocery, and while working out I discovered my recurring knee problem was back.
I was trying so so hard to stay positive just like you are. And I was actually doing okay and then when I got home I was like "I made it!" and I was proud. I texted my boyfriend in hopes of sharing that with him but all he did was talk about his day and never asked about mine, even after saying "Today was really testing me and I'm so tired".
I know I shouldn't look for validation and just be proud of myself but omg I just started crying because I feel like a failure again and honestly, I've been on the brink of feeling bad again for the past week and I wasn't sure for how much longer I would be able to keep up this happy stretch for anyway