I just changed default IP camera IP address, from 192.168.1.136 to my whatsmyip org address
Do you realise that your "whatsmyip org" IP address is actually your router external address?
And there is no way that you can have a camera on the LAN that has an IP address equal to your ISP service public IP address ("whatsmyip org" address).
It might be best if you explain what you are trying to achieve.
A suggestion to possibly recover the camera:
Do you have a spare switch or router? Something that you could plug the camera into and the PC into, and nothing else connected?
If so - change the PC IP address to be just 1 different from the address you used for the camera, on the rightmost digit.
Try to access the camera via the browser with your "whatsmyip org" address.
If that works - put the camera IP address back the way it was.
If no spare switch or router - you could try a direct cable connection between camera and PC.
Good luck ...