Do you have any PRN medications? For example, some people find that benzos (Klonopin, Xanax, Ativan, etc.) helps them relax for a bit. Benzos kinda slow you down and keep you in zen mode.

If you don't have any PRNs or your PRNs don't work, how about meditating? Or, you can listen to music and focus on the lyrics. Heck, if you live alone, then you can sing them out loud to really force your brain to think about one thing. Audiobooks would work the same way, if you're into that.

Also, some people find that showers (especially cold ones) are relaxing. You could try that too if you haven't done that already.