Sudden bounds of guilt/sadness?

So I’m an adult with ADD. Is this a symptom?

Every now and then (not often) I find a reason to make myself super upset. Sometimes I make myself feel really guilty or gross, mostly over things that happened years ago. Like I suddenly remember that I’m a horrible person. I had a hard time knowing what was socially acceptable as a teen and my mind likes bringing that stuff up to make me feel bad. (i never really did anything wrong, i was just weird)

Sometimes I just make myself really sad. To the point where nothing is enjoyable anymore. I talk to my mom about it and whenever I’m in one of these “sad/guilty” periods she finds my reason for being upset to be ridiculous.

Does anyone else have experience with this? Is there a way to stop it?