UPDATE!
I'm now just over 2 weeks post-takedown and things are finally starting to get better. The spasms have stopped, and I'm learning to pass gas (still a challenge!)
I've started taking Beano with my evening meal to make the nights more settling. I've found that this helped.
In terms of bathroom visits, I'm now down to 4 a day and none during the night! I'm very happy with this progress and am looking forward to starting my life again. Thanks once again for the support guys.