I think the gentlest tablets you can get are senna or dulcolax pearls ( not the tablets ) although I still find these give me horrendous cramps , i am afraid the nature of the bowel means that tablet form laxatives are very harsh and not suitable for regular use , I actually find that if I use 2 sachets of movicol with a pint of water with orange flavour in I enjoy it and find its quite filling too so great in those hungry times
I hope you get sorted