OP I would say get onto as many NA meetings / other support groups while you're doing this. If you PM me I can add you to some ladies only wattsapp groups with links and support.
For me personally I couldn't do cold turkey - I got onto a substitute medication (subutex) and then tapered off thar slowly. I appreciate though that you may not want or be able to do that so here's some practical tips.
Firstly, it won't kill you. You might feel like it will, but it won't. With support you can do this. You really really can.
Try not to stop in bed if you can help it. Try and get up, even if it means you sit on the sofa watching tv. Get dressed, even if it means trackies and a top. When I'm in bed all day it just makes the day seem endless and does nothing good for my mental health.
Make allowances for being ill but still try and do life. By that I mean get up, get dressed, watch TV or Potter, basically try not to be in a si t uation where all you are doing is wallowing I'm bed because it will help
Showers help, or a hot bath if you have one. Get an alternative bedroom routine as if you're like me the pills have been it for the last however long! Shower, fresh jarmas, cuppa or hot milk, read book, bed. I find if I can't sleep putting on a bedtime meditation helps. Or watching old porridge reruns sends me off. Its normal to struggle to sleep but with that said, maybe go to the chemist and get some kalm or similar if needed. Also remember no one died of lack of sleep naturally - you might feel shit but it'll pass.
Be kind to yourself. Immodium for the bathroom problems, use wetwipes rather than loo roll for soreness, paracetamol and ibuprofen for pain relief. Remember you'll only have to do this the once. Also remember mentally your brain is going to go into overdrive. Cold turkey can work for some - for others it can send them back to using. I used to have fears about going to drugs services for similar work related reasons, and a hefty dose of shame, but work were absolutely amazing. I hope you can get through it - but if not there is no shame in going to community drug and alcohol support. Work can't just fire you because of it. They truly can't. I do understand that fear though.
Mentally you may well struggle. Connect, connect, connect. Keep busy, for me I had to keep busy and active doing something as if I thought too long I couldn't handle it. Music, walks, colouring, TV, baking, anything.
I'm sending you love and thoughts OP. Reach out if you need to. I remember being in a similar situation and I am 8months clean on August 1st. There is hope x