I have problems with flies

ever since I was little I had always been scared of flies to the point they have made me tear up, I had flies in my room and I had a somewhat panic attack, I was sweating badly and had a really bad headache. I don't know what to do about this, as everyone thinks I'm overreacting or being a little baby. But I just can't stand them at all, they make me upset and feel unsafe. I really need to know how to get over this, its starting to get embarrassing, I don't want to tell people that I'm scared of flies.