How can I get out of this constant state of overwhelm?

I have 3 kids ages 11, 8 and almost 2. No matter what’s going on I feel overwhelmed, even when I have nothing to do I feel like I should be doing something or that I’m forgetting to do something. My 2 older kids fight so much so that doesn’t help. I just feel on edge all day long. My two older kids also both have adhd and my middle child was just tested for autism (we don’t have the results yet) but he stims a lot (curls up his fingers and walks back and fourth making noises) I just feel like my brain never stops and when I’m “relaxing” my whole body tenses up especially my jaw. I’m taking 40mg vyvance and I just started taking Zoloft last week so I haven’t noticed a difference yet. Is there anything else I can be doing or taking??? I feel like I’m drowning