Feet raised up eg on a step. Leaning forward (as far as you can). Prune juice. On all fours - cat movements (arch and curl back). Circling hips e.g. On birthing ball. I found that magnesium supplements (dissolved in water) helped. Lactulose from the pharmacy (not helpful now at all, sorry). Having hot drink e.g. Herbal tea as first drink in morning.
Best of luck - I didn't suffer too badly in pregnancy but after an epidural and instrumental birth I struggled like hell. Tried everything and the things above worked nicely. Though too much lactulose has too much of an effect.
I'm in the same boat OP. Hope you're feeling ok now. I still haven't managed to go and now realise that I have a haemorrhoid and I'm too scared to try any more Met my mum as I came out of the bathroom and ended up crying to her about my 'situation' and then DH and along and they both gave me a comforting pep talk and promised we'd go to the pharmacy tomorrow. Oh the indignity!
Glycerin suppositories and if really bad, some Vaseline and a rubber glove I'm 30weeks and feeling your pain. Got laxido from doctors but it makes heart burn intolerable and some phosphate enemas for when it's really bad. Very glam.