I would try the Dinet forum as although they haven't got MG you need to be mindful of any antidepressants effect on your OI as well as your MG.

A lot of people with OI and POTS suffer with anxiety due to the body sending out adrenaline and the like at the wrong times. The Dinet site if you aren't aware of it is a good place to ask questions - just like this one!

This is the link http://forums.dinet.org/

I hope this helps

Rach