I have IBS, asthma, allergies, non-allergic rhinitis, fibromyalgia, was diagnosed with CFS (but my new Dr. doesn't agree), PTSD with DID, eczema, pseudo-seizures.
I have to watch what I do, how much and how often. I plan my day very strategically with breaks, snacks and hydration. It has taken me several years to get a decent routine. Like TLight and others have said, down time and rest are essential. If I push too much, I have noticed that my pain level goes way up.
I have no scientific data to support this, but it seems like my electrolytes get imbalanced and I get dehydrated. I wonder if this might have to do with the extra adrenaline to keep going?
The other thing in general is flexibility with my plans. I find this still very hard to do. I like to set my goals and keep them! But, a lot of the time, I have to stop before I get everything done. I have to listen to my body.
Ways I help with pain are gentle exercise 4 to 5 times a week. I walk and alternate a floor routine that has physical therapy exercises for my knees and hips plus gentle stretches. Depending on my energy level, I vary the intensity. The breathing that goes with the exercise I think helps ground me some too.
Another things that I have noticed make me worse are caffeine and chocolate. I still have them occasionally, but I pay for it.
As Junebug mentioned, it's hard to know if CFS and Fibro are part of PTSD or not. My T believes they are the same. She doesn't have scientific evidence to support her theory, BUT she is a trauma therapist. Most of her trauma patients exhibit symptoms of Fibro and CFS. The other possibility is that the stress from PTSD makes us vulnerable for these strange illnesses.