This issue has been discussed extensively before, see https://rareshare.org/topics/869
The key questions to consider are: (1) Are you or not on an IVIG therapy and dosage with a proven track record of having stopped all episodes of SCLS? And (2) Will you be going to an isolated, backward place or one where there is a major trauma center/university hospital nearby, in a First-World country where English is understood and where quality-grade IVIG will be available? In sum, your medical history and the nature of your destination matter a great deal.
[Robert's (rnuara) comment above doesn't make it clear that he has been on a steady and successful IVIG therapy for over six years, and that he has been episode-free since then.]
Regardless of the answers to the prior questions, if you decide to travel within your own country or internationally, it's a very good idea to take with you: (a) written instructions in English from your physician on what is to be done to you should you experience the classic SCLS triad of hemoconcentration, hypoalbuminimia, and hypotension; (b) one or more key, printed-out, English-language medical articles on SCLS, to include "The Clinical Picture of Severe Systemic Capillary-Leak Syndrome Episodes Requiring ICU Admission," https://journals.lww.com/ccmjournal/Abstract/2017/07000/The_Clinical_Picture_of_Severe_Systemic.15.aspx, available via most libraries or else from me by request, for you to take and hand out at the Emergency Room of the nearest hospital; and (c) ample medical insurance coverage including eventual air repatriation to your country and city of residence.