You may have just caught a different variant than you did the first time? That would make sense to me! If you aren't already vaccinated, please get the vaccines (if you can)! Trust me, even if you catch covid while vaccinated, it's still easier than having it unvaccinated.
But if you are already all vaxxed up, a new booster is around the corner for the main public (at least in the US?)! But, if you have respiratory issues like asthma or if you're otherwise immunocompromised, you can already ask to get it! I planned to get mine this week but forgot -_-. I'll have to check if the local Walgreens has em yet.
Also btw, if you do live in US and don't know already, you can get 8 FREE at-home covid test kits from the government, delivered by USPS by ordering them from here. I always make sure to spread the word about them since I know some people hadn't heard about that government program.
Stay safe and vaxxed and feel better soon!