They are pretty normal symptoms , I wouldn't bother too much about the mucous and blood for the initial month. After that it will just be mucous/ yellow residual stool. J pouch is partially connected to the intestine so whatever you'll eat some fluid will pass through causing you to go and its the glands which were around the colon which used to produce mucous that still keep producing it that causes mucous formation post op. Also you need to remember that entire colon has been pulled out of you by cutting it so pain on the insides is normal too. It will all decrease with time and once jpouch is connected and it stablizes the mucous and other issues will go away too.
For the mucous part I too used to fret alot with it but after a month, one day I held back for as long as I could and it reduced drastically. The more you go to release it , the more it keeps on building. That was how it went for me.