Hi @Claudie
I know that feeling of just not being able to shake this nagging feeling that something worse is coming but not knowing when or why.
I try to acknowledge what i'm feeling especially when it comes to my reactions to things others have said or done to me. I try to work out i'm just being overly sensitive or do I have legitimate reasons to feel hurt or angry. I feel like I tend to assume I overreact to a lot of things when I'm feeling down, so trying to be honest with myself and work out which feelings are more justified that others, helps me get a bit of clarity and just take some of the load off my mind.
As @tyme suggested, the fact that you realise what is going on is a positive sign that you can stop this slide before it becomes much worse. I know I've noticed that things recently that get me feeling down again, worry me, but then I remember that even 6 months ago, those same things would have sent me down much worse and much faster, so I take the fact that that doesn't seem to happen as much now as a good sign of progress. A big part of that has been reaching out and talking to people when I start to feel it... something I wouldn't have done before. So again, I see you talking about it here, as another positive sign that you're probably in more control that you give yourself credit for.
We all have these days were we feel low and I try to look at it as not a step backwards at all, but just a low day or two, and take confidence that I feel better equipped not to work my way out of it without it getting too bad now. Like distractions, with doing something I enjoy, work much better now than they would have earlier in the year and just having a bit more trust in myself and knowing that it's okay to feel down sometimes because things can be difficult and none of this is easy, but remembering progress I have made and take confidence from that.
So I think it's okay to feel how you're feeling but try not to add more to the pile by adding worry about whether things may get worse. Hopefully just taking about it is helpful and it passes soon and you're feeling better about things soon.