You seem to have the even more rare, chronic version of this (for all practical purposes, incurable) disease. One of the other members of this Community has it also.
Have you/your doctors consulted with Dr. Philip R. Greipp of the Mayo Clinic, who is this country's leading authority on SCLS?
Also, have you/your doctors considered using long-term, monthly IVIg treatment, which has been tried with partial success in Europe? Have them check out the just-published articles posted under Disorder Resources, "High-dose intravenous immunoglobulins dramatically reverse systemic capillary leak syndrome" and discuss it with Dr. Greipp. It's risky, expensive and experimental, though.
It would be good to know more details about what exactly you've tried (dosage, frequency, etc.) in such a short time.