Your issues might be with your kidneys not your bladder. See a nephrologist.
It is common to have kidney issues and blood and protein in your urine. Can't explain the pain you are feeling.
Don't know where you live but if there is a teaching hospital or major medical school you might go there to get help.
Mixed connective tissue disease (systemic lupus, scleroderma, polymyositis), Raynauds phenomena, Hypertension, Barrett's esophagus.
Meds: prednisone 5mg, 50mg imuran, Lotrel 40/5mg, maxide 37.5/25mg, folic acid, potassium, aciphex 20mg, multi vitamins.
Maintain your optimism and you can beat the odds.
"Although the world is full of suffering, it is also full of the overcoming of it." Helen Keller