When I got bitten last year, my boss said to watch for a thin red line - I guess yours looks like a streak?

If I got that, I go get help ASAP - because it signals blood poisoning.

Here is a thought - call your local Humane or or vet or whoever and ask them about a doctor who knows about this stuff! I am sure the staff there have a favourite!
They get bitten...

I know it's hard to keep trying when that hurts so much - and I KNOW what it feels like!

Catty1