I Use Migergot Suppostories For Chronic Migraines. I Find That

I use Migergot suppostories for chronic migraines. I find that I will not be able to pay for them after 12-31-14. My co-pay will be $875 though Blue Cross Blu Shield. They are the only medication that helps at all so I am afraid I will not be able to function. First why is the cost of this medication so high. Second, can I get help in paying for this?