After reading this, I would suggest a second opinion from another rheumatologist as soon as possible. I don't feel like you are being treated, but instead being dismissed. While it may indeed be nothing of consequence, something is certainly happening to give you symptoms. If don't have confidence in your Dr, and don't feel reassured... ?
Unexpected, persistent coughing for months could be nothing, could be serious. Should be investigated! Same with swelling (fluid retention?) in the lower limbs.
One way to find a good rheumy is to check out [utl]www.lupus.org and find the local chapter. Then talk to the local chapter to find out what rheumies in your area are active in the group -- those are the Drs you want to choose from.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde