Hiv symptoms but tested negative ?

So around 3 months ago I had unprotected sex with someone and shortly after developed symptoms similar to herpes. So I went to my doctor and asked for an std test and also an hiv test as I was also having hiv symptoms at the time. Everything came back negative including the hiv test. However I don't know what would be causing my symptoms. My symptoms are :

•weakness

•sore and aching muscles

•sore throat that comes and goes

•yeast infection and bacterial infection

•nausea

•weight gain without a change in diet

•dizziness

•racing heart at times not always

•shortness of breath at times

•swollen lymph node on one side of the neck

However the person that possibly could have infected me claims he regularly gets blood tests done and has been tested for stds. I'm just worried that I maybe tested too early . I tested around 1 month after possible infection. Is it possible to get a negative test when I'm positive if I test only a month after ? im really scared to go do a second test as I don't want to go through all the anxiety that it caused me doing the first test .

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