Hi, I Am Asian Male Boy , I Have Sex

Hi, I am asian male boy , I have sex unprotectived with male last 14 days.1 wk ago l have watery diarrhea duration about 2 day , no fever . now clinical resolved
My underlying diseases is chronic HBV, chronic urticaria, allergic rhinitis.
About 1 year First time I have tested with rapid anti HIV test ( result faint T line in kid test , At clinic AntiHIV -NR )
Last 6 mo, I also have tested again and It same result ( faint T line, anti HIV -NR )
2 day ago, I repeat anti rapid HIV and oral quick tests , It also faint T line result, but anti HIV -reactive by CMIA ....So sad
Now I am very nervous and feel depressed sometime, I have many questions
1. Faint T line on rapid anti HIV test and oral quick test . Might it be from my chronic HBV, urticaria , Hypersensitivity reactions or orther viral infection such diarrhea.
2. Anti HIV reactive by 4 th gen CMIA what does it meant, Could it be false positive from other infection or vaccine ( HBV, viral diarrhea , influenzae vaccine - I have influenzae vaccine last 3 mo )
3. What is the other rapid confirm test that I should do , is it HIV PCR
4. How many percent of HIV in case of faint T-line result on rapid test

Thank you so much