Feeling helpless - expensive and impossible to get my hands on.

Finally got my PA approved by my insurance (Blue Shield of California). Not sure if this means its covered or not covered by the insurance, but the pharmacy told me after running insurance, my copayment is $700 (not including coupon). My medical deductible is $2300, and my pharmacy usage deductible is $450 and both out-of-pocket maximums are $8670.

Not sure what this all means since I'm illiterate when it comes to how this works.

Any suggestions on next steps to take? TIA!