Why have I been having diarrhea for weeks?

I’ve always had weird pooping habits (sorry this whole thing is gonna be tmi but I really don’t know what to do) usually it would be mild constipation and regular poop but now like all summer basically it’s been severe constipation for days then extreme diarrhea for days and like my poop isn’t liquid it’s solid... show more I’ve always had weird pooping habits (sorry this whole thing is gonna be tmi but I really don’t know what to do) usually it would be mild constipation and regular poop but now like all summer basically it’s been severe constipation for days then extreme diarrhea for days and like my poop isn’t liquid it’s solid enough to hold shape but that’s it and it hurts a lot and 3 weeks ago it started getting really bad I just want it to stop and idk why it’s happening
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