I haven't heard of any meds for this, but there might be some techniques to help you stay grounded.

I got these from a Psych Central article:
“If your distress is so high that you’re feeling unsafe, and unable to access your other resources, you need to ground yourself first,” Eddins said. Grounding simply means anchoring yourself back to the present moment.

Eddins shared these grounding techniques:

Run cool or warm water over your hands.

Notice your body, such as practicing a body scan or clenching and releasing your fists.

Notice five things you can hear; five things you see in the room; five things you sense, such as certain textures touching your skin.

Remember words to an inspirational song, quote or poem that helps you feel better.

Remember a safe place and describe it in detail using your senses.

Count backwards in 7s or 9s.

Visualize yourself gliding away on skates, away from the pain you’re currently feeling.

Change the TV channel to a soothing show.

Change the radio station to something pleasant.

Imagine a wall as a buffer between you and your pain.

There are some more ideas in the full article: 9 Healthy Ways to Deal with Distress

Have you talked to a doctor about the depersonalization? Maybe they would know something that would help.