OP,
I was in this position a few years ago and I really feel for you.
I felt so desperate to poo, I would have done anything. I passed out on the toilet twice just trying to pass the stool, and that didn't include all of the other times I tried! I put surgical gloves on and tried to manually evacuate my bowels, I squatted and pushed, I took glycerine suppositories, dulcolax (which gave me horrific tummyache), dulcoease, drank prune juice, walked as much as possible, rocked back and forth, massaged my tummy, massaged pressure points on my hands, lay on my left side, drank litres and litres of water, took warm baths while massaging my tummy on the left side, and tried lactulose for days but nothing was helping. It felt impossible and it consumed all of my thoughts. I felt ill and sluggish, I could feel it there but no matter how hard I tried I could not get it out.
As the days passed with no joy, I became more and more desperate but also anxious to keep trying in case I passed out again, while also knowing that the longer it took, the worse it was going to be!
Eventually, I convinced myself I was in big trouble and then the panic set in! Once I'd decided I was doomed, I called a good friend and asked them to come over because I was so disregulated. When they arrived, I explained the situation and then for the first time ever, had a massive panic attack. I honestly believed I was dying, couldnt speak because I couldn't breathe and my friend thought I was having a heart attack. Yes, it was that bad!!
My friend called 999 and an ambulance arrived, took my vitals, asked my friend for the background, and explained I was having a panic attack and that despite my anxious state, they could not do anything to help me.
The ambulance staff advised trying microlax.
I did have a dose of Microlax from a previous bout of constipation. I was bloody Terrified of using it because despite wanting it to be over, I knew it was going to be very difficult and I may potentially pass out again.
My friend insisted on staying while i administered the microlax and then remained with me when after 15 minutes, I tried to go again. I was sat on the toilet for what felt like a long time, yes straining, yes, sweating, but after a while, I felt movement and with a gargantuan push, I actually went. 🥳🥳🥳🥳🥳
The relief when it came out was immense!!
I had no idea that constipation could feel so horrendous before then.
Since then, I take magnesium every single night!! I drink plenty of water and I eat much healthier and I have not suffered in years now!
So in short, microlax and daily magnesium thereafter worked wonders for me.