Has anybody experienced this?

So I wasn't sure if I was going to post anything but I thought if anyone might have experienced something like this then this group would be the perfect place to ask.

My mental health has been up and down recently and I was sectioned earlier on in the summer but I've been doing really well since.

However today I've had this overwhelming sense of dread. I keep feeling like something bad is going to happen and I've never had this experience before so don't know if it's part of my anxiety or other mental health issues?