Kissing and oral sex (mouth to penis) are risk free for HIV. Also, your HIV test result at 51 days is condlusive. (Official advice remains testing at 3 months or more, but in truth the antibody tests are considered conclusive at 6+ weeks after the last exposure.
And no, "localized night sweats" do not indicate HIV.
So all is well. You can move on without worry.
Thank you very much for your help I greatly appreciate it..I'll move on now