I have Sjogren's Syndrome and I had a lot of the symptoms you mentioned before I was diagnosed (fatigue, cold, just feeling unwell). I had recurring UTI's and kidney infections but my old doctor never ran a blood panel or a urine culture. I used to get leg and foot cramps every day, but they have subsided since I started on potassium supplements for low blood potassium. My kidney disease is caused by the Sjogren's syndrome.
Have you had a physical recently? I didn't know I had reduced kidney function until I had a physical last year and my (new) doctor got the results of my blood tests. You might want to schedule an appointment and tell the doctor all your symptoms, and she/he will order tests to see what's going on.
I wish you luck!
29 year old female (full-time accountant/part-time student)
Dx'd 2009: Primary Sjogren's Syndrome, distal RTA, bilateral nephrocalcinosis (calcium-oxalate), chronic interstitial nephritis, Stage 3 CKD, Raynaud's Phenomenon
Rx: Cellcept 500mg 2x/d, Plaquenil 200mg 2x/d, Prednisone 20mg/d (tapering), Urocit-K 3mEq 3x/d, hydrochlorothiazide 12.5mg/d, potassium chloride 20mEq/d, Restasis, Numoisyn, Nystatin