Physical stress can certainly affect our Lupus and can even predispose us to flares. Surgery is an example of physical stress. Surgery is a big undertaking in people with lupus and it is usually recommended that the disease be well controlled prior to any surgery in order to make the procedure as safe as possible and to increase the likelihood of a good result from the operation. I would say that the best way to prepare for you surgery is to do all that is possible to get your Lupus under control. There is probably no way that you can avoid the stress, but if your disease is managed, perhaps the stress will not have as much of a devastating affect.
Otherwise, you might be well served to find ways of alleviating your stress since it seems to cause so much problems after surgery. :lol:
I wish you the very best.
Peace and Blessings
Look For The Good and Praise It!