Thanks guys!

OOM, I thought about this too. Symptoms came very quickly, and soon after a couple of dinners with friends, so I also think it probably isn't COVID. I had an old COVID test kit at home, which had already expired (about 1 year past expiration). I did it nonetheless, and it came out negative.

Quite harsh indeed, high fever, shivers, cycling on/off between painkillers. Came in the most unfortunate of times...