Panic attack vs heart attack (anxiety?)

For the past 3 weeks i’ve been occasionally feeling some strange kind of feeling in my left side of the chest and left arm. It wasn’t unbearable pain but enough to worry me. 3 weeks earlier prior to these symptoms i had what i thought was heart attack except my symptoms increased when i started overthinking and googling what might be the case. I got tingles in my left arm and sudden flash of cold sweat followed up with nausea and i almost blacked out. I havent went to the ER but week after i got fever so i went to the doctor and explained my symptoms. We did ecg, blood tests and blood pressure but all the results came back normal. I also got scheduled for cardiologist in 3 weeks but until then i want someone to ease my mind and overall wondered if anyone has experienced anything similar? Could it really be anxiety or should i keep worrying?