Yes freaking out can cause a lot of symptoms and also lower your immune system. It is very unlikely you got an STD from oral unless it was oral to a man. It may also just be a virus that will pass very soon. Take it easy.
Could I be freaking my self out so much that I am giving myself false symptoms?
It could be an STD perhaps GC. But it could also be a strep throat or a virus. Do you have a fever or any pus in your throat (white bumps or patches near the tonsils or the back of your throat)? If do you it could be a strep throat. IF no fever and no pus but just a red throat it maybe a virus. It should pass in a couple of days if it is a virus. If it dosen't get better then see a doctor and be honest about the oral sex. They can easily do a throat swab for GC and also a culture for strep throat or a rapid strep test and culture. Hope this helps.