Hello. Thank you for posting your query at DoctorSpring.com
I understand your concern.
To answer your questions one by one :
1) In your case the chance of acquiring STD is negligible.
2) If you get the STD panel tested at this point, all the STDs including HIV can be tested and ruled out.
3) I feel this feelings are due to anxiety and rightfully so.
Since you had a condom on, it almose negates your chances of getting a STD. The condom tear is more of a concern for pregnancy and since you immediately changed the condom it should be fine. There is a very minute possibility, almost negligible.
Moreover you still did not develop any symptoms such as sores, or rash, or low grade fever, and that completely negates chances of you getting any STD.
The tingling can be attributed to anxiety. Please do not worry. According to me you're safe.
Just so that you can have a conclusive evidence, you can go ahead and get the STD panel tested out, more so for your own satisfaction, so that you can stop worrying once in for all.
Hope this was helpful,
Regards