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So first, breathe.
You used a condom for everything, so that makes your risks really low.
The condom means that you have no risk for HIV, gonorrhea, chlamydia, NGU, trich, and mycoplasma.
You have a low risk for syphilis, herpes type 2 and HPV.
Syphilis isn't that common in developed countries (the US, UK, countries in Europe, Canada, etc.), and you'd have to come into direct contact with a sore.
Herpes type 2 and HPV possible, but condoms offer significant protection.
Anal sex can cause micro tears in the anus, and healing of those can cause itching, so I wouldn't worry about that.
Stress can cause diarrhea, as can alcohol, if that was a factor.
Remember that guilt does not equal risk.