Aw Lindzi sorry you're struggling so badly. I'd definitely speak to your CDC like the others suggest, and even moving up the plans for a bit might give you a bit of relief from being bunged up. Have you tried taking psyllium husks from holland and barratt? They worked for me in the past they're a fibre, or there's the Fibresure stuff which you can add to your shakes once things are moving again to prevent further constipation. But you need to get things on the move again first, I took sennacot, it's quick on gentle.
I really hope you get sorted out with your periods too, have you been to the docs recently? xxx