Can I obtain a copy of my husband's medical records if he is addicted to prescription medication?

I am in the state of Texas. My husband has taken prescription medication. He has several doctors and different pharmacies, and at one time they wanted him to go to rehab. He has verbally abused me and I had left him several times because of this. Is there anyway I can use his medical records in court showing he's not stable enough to get custody of our 2 children? I have custody now but he wants to fight me. My husband is also a licensed police officer so he knows better to be addicted to pain medication. I have pictures and recordings and text messages saying he's addicted to pain pills and he has anger issues. I need to know can I obtain his medical records for a child custody case?? Please help?? Thank you so much.