First, don't use 2 condoms. The friction from them rubbing on each can make it easier for them to come off, and the protection of one is sufficient.
You are at pretty low risk here, and what you'd be at risk for is herpes, syphilis and gonorrhea. Since you've had no symptoms, I wouldn't overly worry about it, but if you must test, go for it to ease your mind.
Whether or not you ejaculate into someone has no effect on your risk - it does on your partner's risk level, but not yours.
Your tingling and hand stuff are all likely anxiety and hyper-focusing on your body because you're scared. No STD symptoms would travel over your body like this.