Anxiety WILL do that to us. Plus, once we have a health anxiety, we begin to hyper focus and we feel every itch, pain, twitch, tingle way more than we normally would and we associate it with doom. Stop looking up symptoms and get busy. Your tingling arms and sweating will be less most likely. And at the appropriate time, get tested for std's. Really, most are treatable if you did have one and not a big deal. Don't over react. And you probably didn't get one. You are just anxious. What you need to REALLY consider to be the dangerous element here rather than an std is your anxiety. Get treated for that and you will handle what comes in life so much better. Talk to your doctor about anxiety disorder if this doesn't pass and is causing a great deal of impact on your life (constant worry, unable to focus or do other things, irrational thought, and it lasts 2 weeks or more) . good luck