Light red blood is typically from hemorrhoids. Cramping and just feeling 'off', bloating, tight etc., in your belly / bowels can be IBS. IBS is pretty darn common for anxiety peeps. Look it up at Mayo Clinic online. But, do not go googling around and playing Dr. Stop after you read about IBS....you'll get all freaked out if you keep on digging around on the internet:)
Constipation can be part of IBS. Cramping is def part of IBS, in my experience.
Of course, I'm no doc. We all have to have a baseline of health from our Docs. So, if you haven't had a physical / checkup lately, then you need to do so, so you can establish your overall health, which I'm sure I fine:)
Peace and Feel Well:)