How to stop the fear of recurring cellulitis?

Hi All,
I’ve just gotten over what the Dr thinks was cellulitis. I got a spider bite we think that over 24 hours just started turning gross, red and swollen. 4th day of antibiotics and nothing left but a bruise looking area and a small ulcer.
I have no idea why I got it, I’m healthy, not diabetic.
Now I have a fear of every little cut or mosquito bite will turn into cellulitis again, I’ve read once you have it you’re likely to get it again.
Anyone know or have tips how to avoid cellulitis. The don’t get bitten or cut option doesn’t apply to me. I’m clumsy and bugs love me.
Anyone had cellulitis and never got it again?
Why does having it one predispose yourself to getting it again?
Is there even a God!

Help!
Thank you.