Is There Any Effect Of Oxycotin And Percocet In Pregnancy?

I have been perscribed oxycotin and percocet for chronic pain now for about 2 years. I am now 6 months pregnant and have been trying to ween down with my doctor because I do not want them to effect my baby and I dont want her to be dependent on them when she is born. I have horrrible anxiety and panic and anxity attacks. I had to stop my anxiety meds because they were too risky for the baby. Now that i'm coming off my pain medication the pain is terrible at times and it's causeing more anxity to the point that I cant sleep, eating is so painful sometimes, I cry and feel like I want to crawl out of my skin all the time. I have tried other anxeity meds but nothing works. I went to my doctor/ OBGYN and he said that since I'm in the 2nd trimester I should be ok to take my conlazapam as needed. Can you confirm? Also, he said that it might be safer for me to just stay on the pain medication through-out my pregancy since I'm having such a hard time. He said that even though I want to cut my meds he said that it might just be safer for me as well as the baby to not go through that. I'm on about 40oxycotin and 20percocet a day, sometimes a little more. Can you tell me how long I would have to be off this medication for it to not effect my baby? Also, how would this medication effect her if I was needed to remain on it? If withdrawls are more then likley, does she suffer at all and how long would the withdrawals last? Thank you.