Just a question

Ive been taking 10 hydrocodone 4xs a day for about 8 months now and I had to reschedule my regular monthly refill appointment due to a family emergency out of state and they cant get me in until 20 days after I run out is it going to cause withdrawals? Any suggestions on what to do for daily pain without the help of the pain meds? I have Chiari Malformation and have had neck surgery due to a motorcycle accident about 6 months ago and a few other less painful issues but any advice would be appreciated. Thanks