Mini Pillows hasn't pooped for 2 days now, and getting Laxido into her just isn't happening as she doesn't drink anything. She's constantly straining and crying that her bum hurts, but she just won't go

Does anyone have experience of constipation/withholding? We went through this before about a year ago, but Laxido worked better then, even just half a sachet used to make her go almost instantly. She did a massive poo in the bath on Saturday (her first for about a week up until that point) and honestly it was about the length of my hand and the girth of my wrist. It was HUGE.
I think because of that, she's not eating, and is literally consuming a yoghurt and a bag of choc fingers a day and that's it. She refuses anything else. Having said that, I wonder if she's coming down with something AGAIN as she's been warm to the touch today and telling me her ear hurts, fell asleep on the sofa yesterday (I can count on one hand the number of times that's ever happened) and seems to find swallowing food tricky.
Add to that, the complete lack of sleep over the last 4 weeks (waking almost hourly and screaming) and I'm just about to jump off a cliff. I need to go back on my meds I think
Can anyone recommend any good sleep consultants, is there such a thing? I have in desperation ordered those Sleepy Patches that get advertised on Facebook

I think our problem lies in medical issues though, but the GP says she's fine and there's nothing wrong with her so I don't know. Christ, kids are hard.