How to have a clear head and relax the mind

I work a job at my grandparents house cleaning around their house. For example, pledging areas that need it, using glass cleaner to clean dirty glass.etc My biggest problem is my mind as it’s constantly taking over. When I finish cleaning or doing a task, I literally have to ponder on if I completed the whole task (I stand there for a long time going through “ok, did I get this whole spot clean?” and I ponder on things like did I complete the task and have to stand there until I remember yes I did clean this whole spot. I struggle with moving from task to task. Do you guys have any suggestions for how you can tell your brain this is done without pondering if the task really got done or not? Thanks so much!🩵

I can't focus on anything but my thoughts. I'm so inside my head, and my mom always tells me to focus on my body and my surroundings, but I can't, or maybe I just don't know how. I try to, but it doesn't help. The thoughts are still there :(

I’ve been feeling a little bit better these past few days but today it’s been very stressful for me having a lot of hard thoughts and unable to release tension mentally giving me a headache and feelings of panic. Having a hard time connecting with reality. Any ideas or suggestions on how to grab myself and release tension?