Welcome to HCM.
Most of the test for HIV
available in the market are more than 98% sensitive and specific. False positive is rare. If you have high risk for HIV, don't waste your time and money in confirming the same. If you don't have risk for HIV, then you can opt for a Western Blot test. It is more confirmatory than an ELISA
or a Oraquick test. If you have risk, then go straightly for the estimation of Viral load
and CD4 count test which themselves are confirmatory, more reliable and useful to the course of management.
There are very good treatment options are available. With these one can have a comfortable and decent life for more than 30 years. A total cure is on the pipeline.
So nothing to worry and follow strictly the guidelines of your physician.
You will be alright.