Do you think it may be worth calling a photographer and asking for them to cost up a head and shoulder shot for you. It's one time when going that little extra mile may be worth it in the long run. I think if you explained what you needed the photo for you may find a photographer would be most accommodating and helpful.
Hey... You could even contact your local paper and have them do the story about what's happened and they could then provide you with a professional photo for both their story and your poster shot... problem solved.
Doing a bit of catch up reading this morning and I have just finished reading this thread Mrs Shingles...WOW!
Well done and how fabulous to finally get some recognition for all your pain and suffering. It sounds as though it has given you a real lift too....fantastic especially after all that you have recently endured.