Greetings.
Since you had protected intercourse, your risks for STIs are only theoretical.
Unless you develop symptoms, which is unlikely, I wouldn't worry or do any testing.
Your only possible risks are herpes, syphilis (wouldn't worry) and HPV. But those risks are about equal to the risk your being bitten by a rabid dog while jogging in the park.
Your anxiety is much bigger a problem. You should probably address it first.