Hi Georgina, and thanks for your post and question. If I remember correctly, you have been posting about your concerns with this current medication regimen and being due to take the flu vaccination on our COPD Facebook page.
While we cannot provide medical advice or diagnostics over the internet (for your own safety), your concern certainly warrants a reply.
I would suggest the actual decision as to whether you should take the flu vaccine, while on the antibiotics and steroids, should be made in concert with your physician. My experience has shown there is no real schedule for the flu vaccine - it should be taken at some point prior to the flu season starting. Again, please check this out with your physician and let us know what you find out for this circumstance. Wishing you well, Leon (site moderator)