You have done all the recommended tests. You are negative for HIV, so this is any of these symptoms are far more likely to be a transient illness.
Did you take a Covid test? These are some symptoms of the Omicron variants.

Do you have allergies? Most of these are also symptoms of seasonal allergies.

Let's distinguish between cold symptoms and a potential HIV infection. Cold symptoms will change quickly, over 3-5 days, with mucus getting thicker, a cough starting, and a run down feeling as it attacks your system, then go away in 7-10 days, possibly leaving just a cough. HIV symptoms will linger much longer, gradually becoming more severe over time.

As for the need or advisability of being tested at 6 months after repeated negative tests, no, not necessary or helpful. That old 6 month standard was used because the tests were not as accurate or sensitive as the current test. Here are the most current CDC guidelines:
https://www.cdc.gov/hiv/basics/hiv-testing/hiv-window-period.html
Now it is time to relax, let go, and promise yourself never again to do whatever caused you to need testing this time. If you cannot let go of your anxiety, please talk to a local HIV clinic or to a health provider about how to handle it.