Not sure what is wrong......

So this is being going on for a bit now....but now I am wondering what it could be. I Google it & really found nothing about it. So I turn to you all. Lately I have noticed....about 2 days after my AF is done & gone my pikachu starts to feel a lil irritated. I really don't know how to explain it. I was tested last month for every STD & i t came back negative. So please someone help me....what is wrong with my pikachu