I am sorry about your baby and also your health.
I do know for me under times of stress I feel more pain. I am not sure if it is because I am so tense with my body,lack of sleep,etc. Also I know when I am stressed I seem to tolerate and don't cope as well which in turn makes my pain worse or hard to deal with.
Some also may just be timing because I have flares with no reason behind it.
Are you under the care of doctors and trying forms of treatment