Dear Dr, Hi, I Am Still Afraid Of HIV, Although

Dear Dr,
Hi, I am still afraid of HIV, although it is more then one year after the last test. Is 5 weeks the 4th generation test method conclusive, which means completely safe? I keep feel itchy sometimes and recently I find some protrude 'lump', they seems not to disappear for a few day now and still leaving some impact on the skin. Perhaps they caused by the bitten from mosquito? Very anxious and please forgive the poor English writing here.
Regards
Si Chen