Faecal loading/severe constipation?

I got an xray of my abdomen and turns out the cause of my abdominal pains is chronic constipation and build up of poop in my body. I have been prescribed lactulose and senna but I'm only taking lactulose for now.
Today I went to the toilet 4 times, the 1st time was not good like constipated but the next 3 times was runny and almost like diarrhea.
I do feel a bit lighter but my abdomen is still bloated/protruded and I still have pain.

Will these medicines help or will I die?