I total understand. When I change my diet, the first 6 odd weeks is hell! Usually a toilet break (lol) once every 5-6 days. But then normal visits tend to be every 3-4 days.
Are you drinking plenty of water in the last few weeks? I find it does help, and any kind of laxatives (I take senakot 1-2 a week) dehydrate me. It does make you wee more though! I've found that diet drinks don't help with constipation either, so I minimise them to once every 2-3 days. Same with oily foods - I know everyone is different but I just don't get along with oil-based dishes, so many takeaways are off the menu.
Apart from that, all I can suggest is a little warmed prune juice (tried for the first time this week, god it bloated my belly out i looked 8 months preggers but it helped 12hrs later) and up your fibre intake if possible. Fruit isn't always the best thing to eat in larger quantities if your body hadn't been used to it, especially if you have a touch of IBS.
If it is a constant thing though get to your doctor, the discomfort won't do anything for your temperament in the long term
HTH x