Help Me With My Bowels!?

So about 3 weeks ago, I started to experience stomach pains, accompanied with Diarrhoea. After the bout of Diarrhoea, I have had Constipation ever since, but I had a bowel movement every day, revealing small pellet stool. This morning I went to the toilet, and to my discovery, there were bits of Dark green in there, mixed with a darkish brown colour and chunks of white(?) don’t know what that is. Been three times today but my latest trip discovered that I have no longer pellet like stool but pretty normaly shaped brownish coloured poop? This is still accopined with awful stoach pain, but I’m taking Buscopan for the relief. I would norally take two per day but I have had to exceed to three today, thinking about taking a fourth as I’ in pain as I type. Damn I freakin hate being ill, especially when it’s something to do with your bowels.

Am I coming to the end of constipation? What’s wrong with me?