This year, more than any, it is important that you do get the influenza vaccine. With the CORVID-19 already upon us you need to make sure you are immunized against other viruses since the combination of the 2 illnesses could certainly be fatal. If your GBS was triggered by a previous flu vaccine, i.e., it occurred 2-3 weeks after the vaccination, there is a slightly increased risk of recurrence but it is still extremely small. If your GBS was not triggered by flu vaccination your risk is negligible. The fact that you have diabetes makes it even more important to get vaccinated.