l too get a three month script from emed. But l am not sure about vaccines. l was advised not to have vaccines and certainly not to let my daughter - when she was a baby - to have the MMR. All vaccines contain a preservative which is mercury. The last thing we need. l know the health organisations in Europe are trying to phase out the mercury from vaccines - so it is best to ask first.
My MS reared its ugly head when l was pregnant with my daughter - now 30yrs old. And my GP at the time [now retired] not only was against the vaccines - but he also believed that my amalgum fillings were not doing me any favours. So did the dentist l saw at the Dental Hospital. He was only too pleased to remove them.
So no - l do not think that LDN is a problem when having a flu-jab - but if it contains mercury in the preservative - then that would be a problem.
Try googling vaccines - flu jab - mercury and see what comes up.