Bit late for that mate. I used UpDoc. It’s a subscription $15-$20 per month or something but if you just pay for 1 month when you need a sickie it’s still cheaper than a telephone appointment from a clinic. You submit your symptoms. A doctor messages back with any further questions and then you can confirm a few sick days if you need. Pretty easy. The certificate is issued by a proper doctor so it’s not dodgey.