Yes, when there is a lot of switching or internal turmoil a lot of us get headaches and can get sick to our stomachs as well as other physical feelings. These feelings may or may not respond to normal medications. If I am having a 'parts headache' I don't bother to take aspirin or anything like that because for me it doesn't work. I use a prescribed anti anxiety that can sometimes help. But soothing activities will often help a lot too.
Is there a way to let everyone take turns writing to let out some of the pressure? Have you tried asking them what they want?

Some people around me know some don't. Some I told, others figured it out. Some I have told and got crappy responses... everyone takes it differently.