What is this?

Hi all bit of advice please. Sorry if tmi...this morning I felt like I needed to go for a number two but when I got there it hurt alot and like there wasn't anything to come out. I am 39 + 2 and haven't had problems with constipation I drink enough and eat lots of fibre. It does ease when I get off toilet and walk around. I don't want to push incase of piles. Anyone else experienced this and know what it is....my back is hurting too now :(