The main reason everyone gets frustrated with Airport Security is they can be very inconsistent with their rules.
To be on the safe side I'd probably try and time it so you took the medication the morning of the flight, that way if they absolutly will not let you through with part/all of the medication and syringes, then you have time at the other end to sort it out.
If you have family/friends at the other end, you could always have them ask their local GP the proceedure if you got their requiring a prescription.
Having said that, I believe you'll almost certainly get it all through. You may also be able to write/email the airline before hand, trying to get written permission from them too.