Laxatives aren't good to take everynight if not necessary as they affect the action of your bowel making it unable to act without them aswell. As well as that they can reduce the absorption of nutrients from your gut which can cause nutritional deficiencies. Senna are stimulant laxatives and can irritate your guts and work by taking cause water and electrolytes to be released into your bowel to cause your guts to contract. Lactulose also works by putting water from your body into your guts but it shouldn't really be used with other laxatives so I'd say if this works alone then stick to just the one. With either of them you've got to make sure you drink plenty of water (like throughout the day, not just a glass with the tablet) This is especially important with Lactulose at it is very good at causing dehydration. If you need to take them its best that you do though.
Erm... Have you tried asking about other painkillers. Some don't cause constipation as a side effect as much as others. If you're on Co-codamol (codiene+paracetamol) these often cause bad costipation as they act on receptors in your gut to prevent the muscles from contracting. Some other painkillers which don't work via the same mechanism don't do this so it may be worth talking to your doctor and trying you on something else for a while to see if that helps.
Also, though you said it doesn't help, eating high fibre diets may help and mean you only have to take one sort of laxative which is DEFINATELY a good idea from what I've learnt. One thing that might help (but probably tastes horrible) is eating bran flakes for your breakfast, even just a bit with some cereal as these can also help as a sort of laxative too but again keep the amount you drink up.
Hope that helps
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