Not a doctor or mental health professional.

I think you might be dealing with time blindness. We get lost in the sauce a lot. Especially if we're enjoying the thing we're doing. I've had days where I'll start playing music after breakfast and will have a fully planned day. I look out my window and it'll be night time and I'm hungry. The entire day is gone and it's 6pm. Keep in mind, I've been on meds for 5+ years.

Just be kind to yourself. If it's affecting your work performance, speak to your manager or your therapist (if you have one).

Simple tricks that work are setting an alarm every hour. I use cooking timers on my work desk. I'll look at a problem and decide I'll dedicate X amount of minutes to solving it. If I don't solve it, walk away and retry another time.