I'm not currently on meds, but even in the past when I was, meditating has always helped me.

Unless there is a heart or low blood pressure issue, meditation can't hurt really. I use the concentration and breathing techniques during panic attacks. I can't even explain how much it helps me to turn my focus to my breathing when I start to freak out.

If you are worried, I would try starting slow and easy... or rather, in short intervals in a comfortable seated position (with a back rest)... maybe 5 minutes at a time to see how it goes. Remember lots of water and take your time getting up after wards. From personal experience... Be ware of the head rush.