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Hope someone can help.
I've only been running for a few months and entered my first half marathon (may 6th)my last run on sunday (10miles) resulted in an Achilles strain, any advice on a "quick fix"
There is no quick fix.
I presume you have iced the area and are resting.
From here your best move is to see a fizzy to find out what is wrong and to get some guidance. It maybe something simple where a massage and stretching is all that is needed or it maybe far more complex. You may be able to run with or without support. However, until you see a physio, a sports one, then you will not know.
Ice it. A lot. If it doesn't feel good by race day, do not start. If it feels ok and you start, and it then starts hurting, step off of the course and get a lift back to the start line. If you do not think you could step off the course because you are too competitive, do not start.